The Gulls outdid the Lions 5-1 at Percy Doyle Reserve led by two goals to Jack Salter.
The hosts held a 2-1 lead at half time, but dominated with a three-goal effort after the break.
Sorrento does not play its next Cup match until June, but returns to National Premier Leagues WA action this weekend.
The Gulls are coming off a 2-1 loss to ECU Joondalup. The sixth-placed side faces Inglewood on Saturday, with eighth-placed ECU Joondalup taking on the Perth Glory youth side.