Vanarama Conference: Forest Green deducted three points
Rovers beat the Sandgrounders 1-0 on Saturday, 9 August - the opening day of the Conference season.
At a hearing in Birmingham, they accepted the charge and offered to replay the game, a request that was rejected by the Conference panel.
The decision is subject to their right of appeal to the Football Association.
The deduction will see the club move down from ninth to 13th in the Conference table.