The Redbacks trailed by 32 runs after the first innings on a testing pitch at Kingston Twin Ovals but fought back brilliantly in the second innings to lead by 347 runs heading into Tasmania’s final turn at the crease.
The Tigers were then bowled out for 251 in 75 overs despite a century to experienced Tasmanian batsman Ben Dunk.
It's South Australia's second second-XI title. The Redbacks claimed the 2005-06 ACB Cup series, with the tournament re-branded as the Futures League since the 2009-10 summer.
Paceman Luke Robins starred for South Australia with 10 wickets for the match, including stunning figures of 6/31 in the first innings.
Big-hitting batsman Alex Ross was instrumental in South Australia’s fightback with a brilliant ton from 169 balls – his second of the tournament and third of the summer for SA.
Emerging allrounder Cam Valente claimed three scalps in both innings and contributed 68 with the bat in an important second-innings stand.
South Australia was the only team to secure four Futures League victories this summer. The Redbacks finished first in the standings ahead of Victoria and last year’s top team Queensland.