The body of Sakrin Im-aim, 45, was found in Dong Yai wildlife sanctuary early Wednesday.
His relatives said he went into Dong Yai forest reserve on Friday to collect wild plants and did not return.
His body was found lying face down in a small hole. His clothes were torn off and he suffed multiple wounds. There were elephant footprints around his body.
His body was sent to the None Din Daeng hospital for an autopsy.