The visitors who are expected to challenge for a promotion place, took a 17th minute lead through Anthony Carney.
Matt Gardner hit a second in the 52nd minute and former Sphinx player Calum Woodward added a third in the 70th minute.
There was some joy for the Sphinx support when leading scoring Kelvin Phillips added to his goal tally with an 82nd minute penalty.
Sphinx take on Highgate United at Sphinx Drive on Tuesday night. Kick off is at 7.45pm.