The SOSA League was formed in November 2008 and offered its first
season in 2009 with over 50 teams participating in age groups from
under 9 to under 16.
The top teams in the SOSA league in age groups under 12 to under 17 can gain promotion to the the East Region Soccer League.
In the OSA Pyramid of Play policy the SOSA League is level 5 for all age groups except under 9 which is a level 6 playing in a Level 5 league
The league is managed by the Southeast Ontario Soccer Association and is headquartered in Kingston, Ontario, Canada