During a career that included stops in England, Germany, Turkey, and Switzerland, he earned 43 caps for Canada before retiring from professional soccer after being unable to recover from a leg injury.

In 2004, Simpson spent time with Boulder Rapids Reserve in the USL Premier Development League where he was named to the PDL all conference team.

[7] Following his second goal of the season against Fenerbahçe in a 2–1 loss January 16, 2012, it was announced the following day that Simpson had terminated his contract with the team over unpaid wages.

[9] Simpson made his Young Boys debut on February 12 as a second half sub for David Degen in a 1–0 victory over FC Sion.

[14] Josh was later chosen in the 23-man roster for the 2009 CONCACAF Gold Cup, Canada won Group A with seven points before being knocked out by Honduras in the Quarter Finals.

[15] Two months later Simpson scored his fourth international goal against Saint Kitts and Nevis in an inconsequential world cup qualifying match, the game ended in a 4–0 victory for the Canadians.