The 19-year-old is already a regular member of Melbourne's starting side, and is regarded very highly in Australia.
Newcastle are understood to have stolen a march on a host of European sides in their attempt to sign the Australian youth international.
"I always wondered what it was like compared to Australia, but I didn't expect it to happen this early, so I'm just going to enjoy the experience," Good told the club's official website.
"It was organised through my manager. They saw me play, though I'm not sure if it was in the A-League or with the national team, but it just happened to come about.
"It's just a short trial. I'll just train and play games, and if they're happy, I'll hopefully get an offer, but if not, then I'll just enjoy the experience."
Newcastle are currently fifth in the Premier League table.