At international level, Larsen has represented Denmark at the 2008 World Junior Ice Hockey Championships, and at the 2009,2010,2012,2013, and 2014 IIHF World Championships with the Denmark men's national ice hockey team.
At international level, Larsen represented Denmark at the 2006 World Junior Championships 2006, and at the Youth World Championships from 2006 to 2009. The 2014 IIHF World Championship in Minsk was the fifth such tournament he participated in with the Denmark men's national ice hockey team.