The list call saw McGuinness' time at Arden Street come to an end after three seasons, having joined the Roos as a Next Generation Academy selection. He would not play a game at AFL level in the blue and white.
For the next chapter in his career, McGuinness will venture to Queensland, joining 2022 VFL grand finalists Southport for next season.
“I'm super excited. It's the next step in my journey to move from Victoria to the Gold Coast and continue playing in a professional environment," McGuinness said in a club statement.
“I came up to check out the club and meet with the coaches and some of the staff which was great. I also have some family and friends up here, so in the end, it was a no-brainer for me.”
McGuinness joins a long list of former AFL-listed players at the Sharks, with the likes of Boyd Woodcock, Zac Foot, Jacob Dawson, Tom Fields, Seb Tape, Jacob Townsend and Brayden Crossley among the long list of former top-flight footballers.
The Sharks managed another strong season in the VFL since joining the league, recording a 13-5 home and away record before booking themselves a spot in the season decider against the Casey Demons.