The highly-rated 19-year-old centre-back made 25 appearances for the Heart in his debut A-League season in 2011-12 and, during a trial with the northern England giants in June, impressed manager Alan Pardew enough to win a permanent deal.
He will join up with his new team-mates later this week when they return from a pre-season trip to Portugal.
Melbourne-born Good, who has played three matches for Australia's under-20s side, was signed for a reported transfer fee of $600,000.
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