Hodgman's signing is a major boost for Australian Rugby, eligible for the Wallabies from November 2024.
The Blues prop debuted against the Wallabies in 2020, going on to play four Tests, and is eligible for Australia through his father.
“I’m looking forward to moving over to Australia with my family and starting new with the Reds," he said in a statement
"Change is good but also comes with its challenges and that excites me.
"A new facility, new coach and a playing group that has been together for a while allows me to bring my experience and just be me.