The 21-year-old applied for a licence shortly after with official word coming through on Monday.
His licence begins on January 1 and runs until December 31.
Thompson said he had not contemplated an international move so early in his career.
“After the meeting on the Sunday I was chatting to (former Racing Victoria chief steward) Terry Bailey and he spoke to me about taking a licence in the coming season,” Thompson said.
“He gave me a couple of days to think about it.
“If you had asked me in October to accept what I just have, I would have laughed.”
He says he will now have to get used to racing two days a week rather than five or six days a week he rides now.
“It really hasn't sunk in yet,” he said.
“I suppose it will when I get on the plane later in December to head up there.”