SKAT puslapis:
Is it possible to bring your foreign registered motor vehicle to Denmark?
It is possible to bring your foreign registered motor vehicle to Denmark. This could be relevant for students or if you are working for a company in Denmark. You must complete the form Application for permit to drive a foreign registered car in Denmark and return it to SKAT.

http://www.skat.dk/SKAT.aspx?oId=1826414&vId=0