The Dockers parted ways with a future fourth-round draft pick for the 190cm Corbett, who has played 36 games and kicked 33 goals in four seasons with the Suns.
Fremantle had hoped to tie Gold Coast's Jeremy Sharp into the arrangement, but will have to strike a separate deal for the hard-running wingman.
Corbett was drafted by the Suns as a mature-age recruit in 2018.
He kicked 25 goals in 12 VFL appearances this season but managed just four games at senior level, including one as an unused substitute.
Fremantle head of player personnel David Walls said the club was delighted to acquire Corbett, who could fill the spot in attack left by North Melbourne-bound Griffin Logue.
"He was a significant contributor to the Suns in 2021 and while he didn't play much at AFL level this year, he continued to perform well in the VFL," Walls said.
"It's clear he's coming to Fremantle with the desire to work hard and earn his place in the team.
"We can see him being a great cultural fit within our group of players who are eager to get the best out of themselves and each other."
Gold Coast list manager Craig Cameron was happy to facilitate a trade for Corbett in exchange for the extra draft pick.
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