The FAA will issue a TR on a private or commercial certificate. The checkride will be done to ATP standards no matter what level certificate the candidate holds. The question is do you want the type on your Sirlankan license or do you want it on a FAA certificate? I don't know if any US training centers are set up with the Sirlankan CAA to issue TRs. If you want it on a FAA certificate you would go through all the hoops an American would go through.