Gudmundsson came to Kristianstad in 2013 and has three Swedish Championship golds with the club.
During his years in the association, Gudmundsson has grown into one of IFK Kristianstad's greatest players of all time with 349 matches.
In Montpellier, he becomes a teammate with the Swedish players Lukas Pellas and Karl Wallinius who join from Lugi.
During the years in Kristianstad, the 31-year-old has been attractive to other clubs but has remained in the club until now.
When French Montpellier heard from him, it was no longer possible to resist.
- Montpellier is a big club, has a good coach who has been in the club for a long time, has won the Champions League and is one of the world's ten best teams. It is a dream in terms of handball, says Gudmundsson to his own website.