Joining Harper in red are teenagers Jake Fraser-McGurk and BBL Development Rookie Mitchell Davey, who will bolster the Renegades core of young talent.
Harper played all 16 games last season and was the club’s leading run scorer (341 runs) with a strike rate of 140.
The wicket-keeper batsman’s top score came against the Brisbane Heat when he struck an unbeaten 56 to guide the Renegades to an eight-wicket win.
“We have a really tight knit group at the Renegades and I’m looking forward to being part of that again,” Harper said.
“Obviously we have a lot of great memories from last season but I think the exciting thing is that this group has so much improvement left in it.
“We’ll be working hard to ensure we give our members and fans plenty to cheer about when BBL|09 gets underway.”
Renegades Coach Andrew McDonald said Harper was an important player in the club’s run to the BBL|08 title.
“Sam was a late addition to our squad last season but ended up playing every match and was a key part of our success,” McDonald said.
“He’s well suited to the T20 format with his range of shots, ability to find the boundary and the fans certainly enjoy watching him play.”
Fraser-McGurk joined the Renegades squad as a replacement player last season but will enter the BBL|09 campaign on the main playing roster.
The 17-year-old Monash Tigers batsman posted five half centuries in Premier Cricket last season and plundered 177 from 113 balls for Vic Metro at the under 17 national carnival.
He also represented the Australian under 19 team last month.
“I really enjoyed my time around the Renegades squad last season. It was a great opportunity to learn from some really experienced players,” Fraser-McGurk said.
“Seeing Mackenzie Harvey and Will Sutherland play in the Big Bash shows there are opportunities for young players if they put in the work, so that will be my focus this season.”
Davey, 18, is a left arm fast bowler and clean striking batsman who will be the club’s BBL Development Rookie this season.
“With the signings of Jake and Mitch we now have five players aged 19 or younger and that provides a great platform to blood some emerging talent in the coming seasons,” List Manager Andrew Lynch said.
“The young guys will complement our senior group really well and they'll learn from some highly decorated and established players.”