Former Rebels coach Tony McGahan will join Thorn on the coaching staff as an assistant.
“I believe actions speak louder than words,” Thorn said.
“I’ve been grateful for the opportunity to spend the last two years at Ballymore coaching the Queensland under-20s, Queensland Country and the Reds.
“I feel I’m contributing to a change in culture and standards in those teams and I look forward to continuing to contribute to this organisation and the success of the Reds.”
He worked as an assistant coach to Stiles in 2017, when the Reds won just four matches for the season and he also coached the Reds’ under-20s team to an undefeated season.