The season began on 23 August 2014 and ended on 7 June 2015.
SNL, was divided into four regional groups with a total of 52 participating clubs.
The winners of the regular season in each group played a promotional two-legged play-offs to decide which two teams would be promoted to the Slovenian Second League.
Reserve teams of the top division sides were ineligible to promote to the second division, due to the rules of the Football Association of Slovenia, which stipulate that one club's main squad and their reserve team must be at least two leagues apart in the country's football pyramid.
Zarica Kranj and Drava Ptuj were promoted to the 2015–16 Slovenian Second League.