 Ambepitiya represented Sri Lanka at the 2008 Commonwealth Youth Games, 2007 World Junior Championships, 2009 World Athletics Championship, 2010 Commonwealth Games, 2010 South Asian Games and the Asian Junior Athletics Championships.Ambepitiya represented Sri Lanka at the 2008 World Junior Athletics Championships, 2008 Commonwealth Youth Games, 2008 Asian Junior Athletics Championships, 2009 World Athletics Championship, 2010 Commonwealth Games and the 2010 South Asian Games.In Commonwealth Youth Games he won 3 Gold medals with 3 new games records.