Steve Johnson is instructed to undergo road trauma education as part of his punishment imposed by the Geelong leadership group after being charged with exceeding the speed limit last week.
This will involve at least 50 hours of working with crash victims and their families over the coming months.
"What is important to us is that Steve be motivated to change by taking action that he has to initiate and follow through on," Geelong captain Tom Harley said.
"We believe that 50 hours working with victims of road trauma is a significant additional sanction for what he has done."
Johnson expressed remorse over his actions, saying, "What I did was completely unacceptable. I have no excuse, no words to explain it. It's up to me to start again and prove myself."
Cats president Frank Costa said that to sack Johnson would be counter-productive despite many believing that Johnson was on his last chance after being suspended by the club for several weeks following an indiscretion last year.
"Sacking is not in the question," he said. "It won't do the boy any good and it won't do the club any good. We have just got to make sure the punishment is right. This has hit him so hard that I would be surprised if we heard of any trouble from Steve Johnson in future."
Geelong's handling of Johnson's charge is later praised by the AFL Players' Association.
"It's a very thoughtful and a very carefully considered sanction," AFLPA chief executive Brendon Gale said.