You can take IELTS tests in Denmark through EDU Tests & Exams.
How can I contact EDU Tests & Exams?
Nikolaj Plads 26, 2. sal
1067 København K
Telephone: +45 7020 28 64 (Monday - Friday 9-17.00)
Do you need to prove your English language level for a UK Visas and Immigration (UKVI) application?
IELTS is on the UKVI list of approved Secure English Language Tests (SELT). If you need an IELTS test result as part of your application to UK Visas and Immigration (UKVI), you will need to take your test at a specific test location authorised by UKVI.
PROFESSIONAL AND UNIVERSITY EXAMS
Professional and University exams are for people who wish to obtain a British professional qualification, such as accountancy and law or a university qualification, such as MBAs and other university degree examinations, including those related to distance learning programmes. Please contact the exams team at Edu-Danmark to find out about the different exams that are offered in Denmark.