Gerrans, whose career includes a victory at Milan-San Remo, Liège-Bastogne-Liège and stage wins at all three Grand Tours, is the third addition to BMC Racing Team's roster for the coming season.
He will be the fourth Australian in the BMC ranks, joining Richie Porte, Rohan Dennis and Miles Scotson.
"BMC Racing Team is a team that I have always admired, not only in their results but also the professionalism of the organization," Gerrans said.
"Obviously, there has always been a strong affiliation with Australians in the team starting with Cadel Evans, and then more recently with Richie Porte, Rohan Dennis and Miles Scotson.
"I'm really excited about the position I have been offered on the team. I always saw myself spending the last period of my career in more of a road captain role and passing on my experiences. I'm looking forward to contributing to the team as both a support rider and leader when called upon.
"It's probably a bit early to start announcing specific goals but I hope to get my season started in Australia. There is obviously a Santos Tour Down Under crown to defend with Richie Porte, and it is a race I've always enjoyed and done well at"
Team General Manager Jum Ochowicz said it was an easy decision to welcome a rider of Gerrans's calibre to BMC Racing Team's ranks.
"As a team, we have multiple goals throughout the season and Simon will, in particular, be a high-level support rider for Richie Porte and Greg Van Avermaet, as well as a rider who can make the most of any opportunity that comes his way. We are looking forward to seeing what Simon can do when he puts on the BMC Racing Team jersey next year."