The Cats have revamped their football operations hierarchy ahead of the new year, with several assistant and chief executive Brian Cook departing Kardinia Park this off-season.
The club has since welcomed back fan-favourite and triple premiership midfielder James Kelly to their coaching fold, with Betts' name the latest to venture to Geelong.
“I am really excited by the opportunity to work with Geelong,” Betts said on the announcement.
“Geelong is a successful club with a magnificent culture that has always been consistently strong, and I cannot wait to get involved. I’m excited to support the club and I’m looking forward to being able to grow myself as well.
"Geelong is known for developing people and that is also an exciting element of joining the club.
“I’m looking forward to working with the playing list, in particular the younger players and helping them develop both on and off the field. It’s important for players to develop skills in all parts of your life.
"Obviously I will spend some time with the forwards, particularly the small forwards, but hope to get across all on-field spaces where the club see they need me.”
Betts is set to take on a developmental role at the Cattery.
Betts is one of only three players to have amassed more than 300 goals with two clubs, joining Lance Franklin and Tony Lockett in being the only ones to do so.