Career
Forn hails from Kvæfjord and played for Harstad Illinois before joining FK Bodø/Glimt ahead of the 2008 season. He did not establish himself in the first team, and was in 2009 loaned out to Alta IF. In 2012 he joined Mjøndalen IF, and eventually played as a first-choice goalkeeper in their 2015 Tippeligaen stint.