Route E22, the road that formerly passed right by the festival area, has been redirectioned and no longer runs through the village of Norje. Of course, the old road is still there, but it is now called route 508. Please be mindful about the fact that many GPS systems have not been updated with these changes.
If you're driving North on E22 (coming from the South): Pass the exits for the city of Sölvesborg, and instead exit on the one taking you towards Mjällby. Make a right towards Mjällby. After about 400 meters, turn left towards Norje. You are now on route 508, which takes you all the way to the festival area in Norje.
If you're driving South on E22 (coming from the North): Exit towards Olofström (this exit comes before you reach the city of Sölvesborg). In the roundabout, turn left towards Pukavik. After about 400 meters, in the next roundabout, turn right towards Norje. Now you are on route 508, which takes you all the way to the festival area in Norje.
Of course, there will also be signs pointing you towards "Sweden Rock Festival".