The Mariners got the better of Western Sydney in last season's final, but Tony Popovic's men gained revenge on Saturday and will now face either Brisbane Roar or Melbourne Victory next weekend.
Youssouf Hersi fired the Wanderers in front at Pirtek Stadium in the 31st minute and victory was sealed by a second goal from Iacopo La Rocca nine minutes from time.
Nikolai Topor-Stanley had hit the crossbar for the hosts prior to Hersi's opener, which saw the midfielder convert from close range after Brendon Santalab had driven the ball across the face of goal.
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