Tuipulotu - who qualifies for Scotland through his Glaswegian grandmother - joins from Japanese side Yamaha Jubilo.
A dynamic ball-carrier with impressive footwork, the Franklin, Australia-born centre made history in 2016 by becoming the first homegrown player to represent the Melbourne Rebels in Super Rugby.
Standing at 5'11" and weighing in at 102kg, the centre made 11 appearances for the franchise in total before moving to Yamaha Jubilo in 2020 for his second stint with the Japanese side.
He made three appearances prior to the COVID-19 enforced curtailment of the Top League, scoring his first try in a Yamaha jersey against Kobelco Steelers.
Equally adept on the wing as he is in midfield, Tuipulotu has also impressed in Australia's National Rugby Championship, scoring 12 tries in 32 appearances for Melbourne Rising.
He was part of the Australia squad for the World Rugby U20 Championships in 2015, 2016 and 2017, scoring a brace against a Scotland side containing future team-mates Scott Cummings and Zander Fagerson in the 2016 tournament.