Prior to the 2015 season it was known as the Southern Premier League and for sponsorship reasons as the Forestry Tasmania Southern Premier League Between 2001-2012 the Southern and Northern Premier Leagues were jointly the state's highest level of soccer competition (but still nationally below the NSL and A-League). During this period the two regional leagues determined a southern and northern champion, who then had a play-off for the state championship.
Between 2006 and 2012 there was no promotion to a higher league, as it was the highest league in Tasmania (equally high as the Northern Tasmanian Premier League). In this period, promotion and relegation occurred to the Southern League One. The bottom-finishing club in the Premier League was relegated to Southern League One the following year and was replaced by the top-finishing club from League One.
Prior to 2006, at the conclusion of each season the bottom Premier League Club had a home and away play-off against the highest-placed League One Club to determine who would play in the Southern Tasmanian Premier League for the following season. As League One previously contained a mix of independent clubs and reserve teams from Premier League clubs (although currently has only independent clubs), the play-off only occurred if an independent club finished top of League One. If a Premier League Club's reserve team finished highest, then the bottom-placed Premier League club stayed in the league the following season.
Relegated club(s) (in League One the following season)
Promoted from League One (in Premier League the following season)