The vehicle struck Thomas early in the day after his birthday party, the report said. He was 41.
No other details about the accident were immediately available.
Thomas was a founding member of the Bang Gang DJs crew and co-founder-director of the music label Sweat It Out, Billboard.com said.
He was "instrumental in shaping the landscape of Australian dance music," a label statement said.
"He was a hugely talented individual and was highly respected by the local and international dance music community as a pioneer and innovator. Adrian touched so many people and it is impossible to sum up his legacy in words."
2014: The Year in Music [PHOTOS]