The scrum-half has played 76 times for Saints since coming through the youth ranks to make his debut in 2020.
But the 22-year-old turned down the offer of a new contract and will head to Australia for the start of the 2025 season on a three-year deal.
“I’ll be forever thankful to St Helens and the lessons that they have taught me both on and off the field,” said Dodd.
With Saints, Dodd has won two Super League titles, the Challenge Cup in 2021 and last year, he kicked the winning drop goal as they beat Penrith Panthers 13-12 to win the World Club Challenge Down Under.
That is one of only two drop goals he has managed, to go along with 26 tries and 13 conversions in his St Helens career.
But Dodd says he will be keen to go out with more cutlery before he gets ready for the next chapter.
“Winning those two trophies for St Helens is the most important thing to me right now,” he stated to the club’s external website.
“I want to be at Old Trafford, where the supporters are holding those trophies, and I want to have another one of those life moments that I can treasure with them.”
