Huang Qiang is accused of raping the 20-year-old sportswoman at a gym at the national aquatics centre in Kuala Lumpur last month.
Huang pleaded not guilty to the charge when he appeared in court in the capital Wednesday, Cheow Wee, a lawyer for the alleged victim, told AFP.
The father of two, who was born in China but now has Malaysian citizenship, faces up to 20 years in jail and caning if found guilty.
"The relevant organisations and associations are giving her full support -- family and friends as well."
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Local media reported that the diver was training with the Malaysian squad for the 2020 Olympics in Tokyo.
Diving is one of Malaysia's strongest sports. In 2016, Pandelela Rinong and Cheong Jun Hoong claimed the country's first Olympic diving silver medal in the synchronised 10-metre platform category.
The country also won all 13 diving gold medals at the Southeast Asian Games in Kuala Lumpur in August.
The judge allowed the defendant bail, with a bond of 50,000 ringgit ($11,800) and subject to several conditions including surrendering his passport.
The next hearing was set for November 6.
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