 In 2001, he was a member of the Canadian U-20 team which finished first in Group A at the 2001 CONCACAF Under-20 Qualification Tournament to qualify for the 2001 FIFA World Youth Championship in Argentina.Thompson made his Canadian Olympic (U-23) team debut in May 2002 and earned six caps with the team in 2004 Olympic qualifying matches.Justin founded the ACT Sports Group in 2003 where he is involved in a number of soccer-related activities, including the organization of team tours from North America to Europe and the designing and overseeing of soccer camps in the UK, as well as the coordination of international professional player transfers.