"Life is short," Pat Knight told the newspaper. "You move on."
Bob Knight, now an ESPN analyst, became a coaching legend while at Indiana from 1971 to 2000, winning three national championships.
But he departed the Hoosiers amid controversy, fired after being caught on tape choking a player and being accused of grabbing a student's arm.
Pat Knight, currently the coach at Lamar University in Texas, said he has tried to convince his father to return.
"As his son, and as a former player, I'm not telling him not to go," Pat Knight told USA Today. "You saw the reaction he got when he went back to Ohio State (in 2011)? I told him he'd get that reaction times 100 if he went back to Indiana.
"I've tried, man, I've tried. Me and (former IU players) Scott May and Quinn Buckner, we've tried. We're working on it. But the guy just doesn't budge. It's really not a big deal to him. He's always done it his way, and right now, he's pretty content just hunting and fishing."
Pat Knight acknowledged the role his father played in building Hoosiers basketball.
"He is Indiana basketball," he said. "We all get fired. It happens. To me, his legacy there outweighs that. And it's not like any of us are getting any younger."
The Associated Press contributed to this report.