The 22-year old New Zealand international and World Cup hopeful spent last season with the Fury but will now saddle up with Branko Culina's Jets after agreeing terms.
"I spoke with Branko and he outlined the role he wants me to play and also the vision he has for his team for next season and that really excited me," Brockie told tribalfootball.com.
"I am really disappointing to leave the Fury but they had been talking about a new deal since before Christmas and nothing ever materialised.
"I would have stayed for (chairman) Don (Matheson) as he was very enthusiastic towards me but the coach (Ian Ferguson) sort of said that he wanted to get in more players and after that then he would see if he could fit me in."
Brockie has fully recovered from a leg injury he sustained during the season and is working hard on his fitness so he gives himself every chance of being selected for the All Whites' World Cup squad.
He is in constant contact with the New Zealand medical and coaching department as he strives to get back to full fitness.