Mr Appo had been due to appear for a hearing at the court on Monday morning.
He had given his house and car keys to the manager of the rugby club, Ms Newcombe told the court.
She said authorities would now work with police in Papua New Guinea to extradite him.
Mr Appo, of Halifax, was sacked by Bradford Bulls after he was charged with the offences.
In a statement the club previously said it had “cancelled Keven Appo’s playing contract”.
Papua New Guinea international Mr Appo played at the 2022 Rugby League World Cup, which was held in England.
He joined the Bulls as a forward in 2023, before signing a new two-year deal in August last year.
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