29-year-old Rainbird is currently part of Tasmania's state squad and joined the Stars during last season as an injury replacement player for Nathan Coulter-Nile, playing five matches and taking five wickets.
Rainbird said he was pleased to join the Stars for this season.
“I am pretty excited to be linking up with the Melbourne Stars ahead of the upcoming KFC BBL season,” Rainbird said.
“I enjoyed my stint with the club last season and the Stars have always been a great outfit in the BBL. I’m looking forward to catching up with the players and coaches ahead of the upcoming season and taking to the field this summer.”
Melbourne Stars Head Coach David Hussey said Rainbird added depth to the club's bowling attack.
“We’re glad to have Sam on board again this season and he gives us options in our bowling unit. As we know, the BBL is an intense competition and a range of pace options will be important” Hussey said.
“Our squad is starting to come together now which is great, with a few more additions to come, and we can’t wait to welcome some new faces and get into the season," Hussey added.
Melbourne Stars Interim General Manager Blair Crouch said the club would be in a place to announce more signings in the next month.
“We’re thrilled to have so many players already committed and will continue to fill out the roster in the coming weeks with some exciting announcements. With the WBBL just around the corner, we are really excited for the upcoming summer for the Melbourne Stars family,” Crouch said.
The Melbourne Stars will open their BBL|11 season against the Sydney Sixers on December 5 at the Sydney Cricket Ground before hosting the Sydney Thunder at the MCG on December 10.
Memberships for the upcoming season are now on sale here.