Where have you seen that they are looking for A320 pilots?
SAS have already filled the need for CRJ pilots in CPH. What I've heard they are looking for mainly B737 pilots for ARN and OSL base.
Regarding the process, it's an online test (I'm guessing Matrigma or something like that, and a personality test), then it's simulator ride, group exercise and then two operational interviews performed with two SAS pilots. Finally a board decision wether you're SAS material or not.