The midfielder - wanted by Manchester United this summer - paired with Niksa Dell'Orco in a match against Brazilians Alvaro Morais Filho and Saymon Barbosa Santos in Croatia.
But Bild say the 28-year-old is now facing a hefty fine for his decision.
Inter are furious Perisic risked injury by playing another sport and the reports claim he will be fined ‘several tens of thousands euros’.
On taking part in the tournament he said: “I always dreamed of participating in a great beach volleyball tournament.
“I’ve been playing since I was ten years old. Sport means to me a lot, I practice every summer when I am in my home.”
Had Perisic reached the final he would have missed the start of pre-season training with Inter.
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The Serie A side may have to sell to comply with FIFA Financial Fair Play regulations.
And the Perisic is said to be keen on a move to Old Trafford this summer.
Inter’s decision to fine their midfielder will only serve to intensify speculation he is set to leave Serie A for the Premier League.
United have already had a £34.7m offer rejected for Perisic as they look to overhaul their squad ahead of a return to the Champions League.
The Red Devils have signed Victor Lindelof from Benfica and have also been linked with Nemanja Matic and Alvaro Morata.
