North Beach had dominated the low-scoring clash for most of day, before a fast-finishing Sorrento kicked two late goals to tie the game at 6.6 (42).
In the tense 10 minutes of extra time Sorrento kicked three points to North Beach’s one to win 6.9 (45) to 6.7 (43).
It was sweet revenge for the Maroon competition minor premier, wearing yellow armbands for charity Child Cancer Awareness, which was comprehensively beaten by the Tigers in the 2012 grand final.
Dolphins ruckman Jordan Power was named best on ground by the umpires, while other good Sorrento players were Nathan Roddy, Callan Smith, Matt Murray, Nathan Humphreys, Ben Hewlett and Pierce Colreavy.
Two Year 8 Sorrento sides also played in grand finals.
Sorrento-Duncraig Hawks were competitive against a strong Wembley line-up, going down 8.12 (60) to 6.3 (39) in the Blue competition.
In the Maroon competition the Wembley Downs Cats White defeated Sorrento Duncraig Dolphins 13.8 (86) to 3.8 (26).