The Kiwi was only headed in the first few laps of the race before taking control of the 36-lap affair.
He expertly managed his tyres on the high-deg Sydney circuit to come home comfortably ahead of Andre Heimgartner and Anton De Pasquale.
The win moves van Gisbergen into third in the standings, 13 points ahead of teammate Broc Feeney and 54 behind leader Brodie Kostecki. Will Brown is still second, 41 points behind Kostecki.
Having fumbled the lead from pole last night, Heimgartner made a perfect getaway from the outside of the front row on Sunday, using the gripper side of the track to charge into an early lead, although his first-lap advantage was as good as it got.
With van Gisbergen stalking the Brad Jones Racing Camaro, a change for the lead had a sense of inevitability about it, and the move came on lap four with a clean pass at Turn 6.
By that stage one title contender was already at the back of the field, Brown taking a high-speed excursion through the dirt at the first corner.
The Erebus driver had found himself on the outside of a three-into-one situation with Anton De Pasquale on the inside, and David Reynolds in the middle, as they argued over seventh place.
Source: Autosport