Egan, 33, resigned from his role as Essendon head of development and VFL coach in September to seek further opportunities elsewhere and he has landed at the Demons under new coach Simon Goodwin, who he previously worked with at the Bombers.
"I'll be helping out with the development and working closely with the younger players with their footy and their life," Egan said of his new role.
"I'm really excited. After five years at Essendon I felt like I was ready for a change and I wanted to work with some really good people and a young list and I ended up here.
"I had a really good relationship with 'Goody' (Goodwin) at Essendon and we went through a few tough years at Essendon, so we've built a strong relationship there. We used to spend a lot of time together and I'm really excited to be on the journey with him."