Cayla Francis and Tess Madgen led the way for the Aussies with 14 points each. Abby Bishop added 12 points, while Marianna Tolo scored 8 points and pulled down 12 rebounds.
For the Canadian side, Kendel Ross top scored with 15 points, while Justine Colley finished with 10 points.
The Australians set up their victory in the first term, when they opened up a 25-14 advantage.
Head coach Phil Brown said the relentless defensive pressure of Australia was a key to the victory.
“Canada showed a lot of heart in the second quarter, but we were able to really tighten up defensively in the third quarter,” he said.
“Our defensive adjustments started to work for us and we wore them down. We also controlled the defensive boards in the second half.”
Brown said the depth of his Australian team will be a key factor in the contest, as it was in the quarter-final with all 12 players rotated through the match.
The semi-final between Australia and the USA will be played tonight at 10:30pm AEST.
Australia 79 (Francis 14, Madgen 14, Bishop 12) def Canada 44 (Ross 15, Colley 10)