This is the third straight Olympics for Canada, currently ranked fourth in the world.
The Canadians never trailed with Natalie Achonwa having a double-double in her second game back from a knee sprained playing for her WNBA team Minnesota.
JiSu Park had 15 points and 11 rebounds for South Korea. Canada opened Group A play with a loss to Serbia, the bronze medalists at the 2016 Rio Games.
South Korea lost to reigning silver medalist Spain in its first Olympics appearance since 2008.