Short answer
Yes, in principle you can. The Student visa route specifically allows what is called “supplementary study” in addition to your main sponsored course. This is separate from the general rule that you must study only with the sponsor named on your Confirmation of Acceptance for Studies (CAS). Supplementary study is a recognised exception, and you do not need permission from UK Visas and Immigration (UKVI) to undertake it, though there are important conditions and limits.
The general study condition
Appendix Student to the Immigration Rules imposes a study condition (ST 27) that a Student must generally only study with the student sponsor that assigned their CAS, unless they are studying at a partner institution of that sponsor or have a pending application in certain circumstances. This is what prevents a sponsored student from simply enrolling on a full second degree elsewhere.
Supplementary study is a distinct, permitted category that sits outside this restriction, which is why it is allowed even though it may be with a different provider.
What counts as supplementary study
The Home Office sponsor guidance describes supplementary study as study taken in addition to your main course, such as evening classes or short courses studied full time during vacation periods. The key features are:
It can be in any subject and does not have to relate to your sponsored degree.
It can be taken at any point during the period of permission granted for your main course, including before, during or after the main course.
You do not need permission from UKVI to take it.
The classic examples are a part time evening language class, a short professional or skills course, or an intensive short course during the summer vacation.
The important limits and conditions
There are several conditions that determine whether a second course is genuinely permissible as supplementary study.
1. It must not hinder your main course. The supplementary study must not in any way interfere with or delay your progress on your sponsored degree. This is a factual test, so a demanding second programme that clashed with your degree commitments would be a problem.
2. It must not delay your departure. If the supplementary study continues after you complete your main course, it must not delay your departure from the UK. You will not be granted an extension of leave to finish supplementary study, so you cannot rely on it to stay longer.
3. It cannot be used to show academic progression. A qualification gained through supplementary study cannot be relied upon by you or a sponsor to demonstrate academic progression for a later visa application.
4. ATAS may still apply. If the supplementary study falls within the subjects listed in Appendix ATAS (typically certain sensitive science, engineering and technology fields), you must obtain an Academic Technology Approval Scheme certificate for it, just as you would for a main course.
5. It must genuinely be supplementary. A second full time degree in its own right would not fit within supplementary study. If what you actually want is to swap onto or add a second substantive programme with another sponsor, that is not supplementary study and would normally require a fresh CAS and a new visa application.
Practical points and next steps
Check your sponsor’s own rules first. Many universities ask students to notify them, or seek advice from their international student support team, before taking on additional study, precisely so they can confirm it will not affect your engagement monitoring and attendance requirements under their sponsor duties. The University of Sheffield guidance, for example, asks students to contact the university before starting supplementary study. Doing this protects you if any question later arises about whether the additional course affected your main studies.
Keep the additional course modest and clearly secondary. An evening class, a part time short course, or a vacation course is squarely within what is contemplated. Anything approaching a second full time qualification carries risk.
If the second course is in an ATAS relevant subject, obtain the ATAS certificate before you start.
Do not plan around using the extra qualification for a future visa, as it will not count towards academic progression, and do not assume you can extend your stay to finish it.
Where the answer could change
The answer depends on exactly what the second course is. If it is a genuine short course or evening class taken alongside your degree, it is permitted supplementary study. If in reality you want to enrol on a second full degree or a substantive programme with a different sponsor, that falls outside supplementary study and you would need a separate CAS and visa application. It would help to confirm the level, length, mode of study (part time, evening, vacation), the provider, and whether the subject is on the ATAS list, as each of these affects the position.
This answer draws on broad legal knowledge and checks current law, guidance and procedure against relevant sources.
Student Sponsor Guidance Document 2: Sponsorship Dutiesassets.publishing.service.gov.ukStudent visa responsibilities | immigration | The University of Sheffieldsheffield.ac.ukStudent and Child Student (accessible) - GOV.UKgov.ukImmigration Rules - Immigration Rules: Appendix Student - Guidance - GOV.UKgov.ukKNOW WHERE YOU STAND
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