ABC Tim Gibson was selected for the space flight from more than one million contestants.

A Queensland man who won a worldwide competition to fly to outer space is preparing for lift-off after five days of intense training.

Tim Gibson has just returned to Australia after the training camp at the Kennedy Space Centre in Florida.

The 28-year-old Yeppoon property manager is not an astronaut, but was among 23 people selected in a competition run by the Lynx Space Academy to fly to outer space.

He was initially selected from more than 1 million entrants.

Astronaut Buzz Aldrin, who became the second person ever to walk on the moon with the Apollo 11 mission, was in the same room when the winners were announced.

"Then they called my name and I thought, no way! No way!" Mr Gibson said.

He says training for the trip has been an incredible experience so far with zero-gravity flights and drills in fighter jets.

"We did a bit of dog fighting, loops, barrel rolls," he said.

"I didn't pass out and wasn't sick which was great."

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Australian space flight winner Tim Gibson prepares for lift-off after winning competition