When you work abroad, you must always apply for a decision on social security.
This also applies if you, for example, is going on a short business trip, conference and the like, if you are going on an internship abroad, if you are self-employed etc.
As an employee, you can apply for Danish Social Security if you will be working abroad.
You will need this:
CPR number (Civil Registration Number)
date of employment
your most recent job if your employment has lasted less than 3 months
the company’s CVR number
Optionally
previous work abroad, including employers and countries
accompanying family members
employment contract (attachment)
posting contract (attachment)