Patrik Weiss, 45, was found dead in his home in the Perth suburb of Lockridge on Monday afternoon.
A murder investigation has been launched into the father-of-two's apparently violent death.
"There are circumstances that are evident at the crime scene that give us (reasons) to suspect that there was third-party involvement," Inspector Geoff DeSanges told reporters this week.
"This does not appear to be a random incident, we don't believe there's any ongoing risk to the community."
Handball Australia said Mr Weiss had been preparing the men's team for the World Beach Games in Bali in August after Australia qualified as Oceania champions.
He had served as the national men's coach since 2013, having arrived from Germany almost a decade earlier.
Mr Weiss worked as a sports physiotherapist and had also worked as a soft tissue therapist for the West Coast Eagles AFL club.
"This tragic news has shocked our community," Handball Australia said.
"Patrik took a great deal of enjoyment and satisfaction in developing the sport of beach handball, the growth of the players and building a positive team culture.
"For this Handball Australia is, and will remain, extremely grateful to Patrik.
"He will be sadly missed but remembered with affection and respect."
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