The 27-year-old has signed a season-long loan deal with the Red Devils.
Salford coach Ian Watson is delighted to have added the player to his squad.
“There are few stronger players in the League than Justin Carney and we are really looking forward to working with and getting him on track with our philosophy and goals here this season,” he said.
“Justin is an immense athlete with a strike rate that is up there with the best in the world. He is exciting to watch and our fans are going to enjoy watching him run at defences week in week out.”