The school's under-16 boys futsal side, made up of mainly of soccer players who hadn't played the indoor game before, was formed for the first time ever in March.

The side won a Lake Macquarie competition earlier this year and then progressed through a northern NSW tournament to qualify for the national Champion of Champions event at the Gold Coast on November 8-10.

They won six of seven pool matches in the national tournament, losing only to Albany Creek State High School.

They then knocked off Newcastle High School in the semi-finals to face-off with Albany Creek for the title.

However, the Warners Bay boys proved too good the second time round and claimed victory 5-3.

Coach and school teacher Michael McGarvey said he was "incredibly surprised" to see the boys advance so far.

"It was the first time we'd even entered the Lake Macquarie tournament," he said.

"The organiser of that was happy that we'd turned up and hoping we'd keep coming back. He didn't think that we'd do that well.

"The first game of our first tournament, the boys didn't know any of the rules.

"Then in the first final against Whitebridge we we're losing 4-1 with two minutes to go and ended up winning in golden-goal extra time with a penalty.

"It's pretty remarkable we made it as far as we did."

Mr McGarvey said while it was an inaugural side, it was made up of "fantastic" soccer players who were quickly able find their feet on the indoor futsal courts.

"They just wanted to win," he said. "They're very competitive young men. They didn't want to lose a game and just got better and better every game they played."

The boys encountered some tough competition on the Gold Coast and lost a player to suspension after a fiery encounter with a Melbourne school.

"There was lots of private and independent schools up there competing," Mr McGarvey said. "It was pretty intense, very competitive.

"We heard on the grapevine they had a few Melbourne City and Melbourne Victory [youth] players. We thought we were going to be up against it and they were very, very big young men.

"But our boys are incredibly skillful. They played exceptionally well. Just a fantastic team, really. All the boys know how to play as a team and that's what got them through."

Milo Bisogni, Nick Pettiford and Ezra Palombini were selected in a merit team and invited to tour Europe.

Warners Bay High principal Marcus Neale said the school was "very proud of the team's achievement and the manner in which they conducted themselves".