The 26-year old from Wagga Wagga in New South Wales made his NRL debut in 2014 with Manly and has spent the last two seasons with Wests Tigers making 16 appearances.
Jack will arrive in Manchester on Monday and will immediately meet up with his new team-mates for pre-season training.
Red Devils’ CEO, Ian Blease, said: “I was extremely impressed with Jack’s attitude when Ian Watson and myself spoke to him.
“I have no doubt he’s going to be a terrific addition to the squad.
“We have been on the lookout for a quality replacement for Michael Dobson and believe we have found him.
“Jack is coming over to make a name for himself and all the Salford fans should be extremely excited to see him in action this coming season.”