Magnolia/Magnet have picked it up for release on DVD, and it's due out on July 21. Amazon has it.
Here's the synopsis:
Detective Techit commits suicide as a way to enter and investigate the eternal-limbo existence of superghouls called Opapatikas. True to the promise made by the daddy of all the hereafter combatants, Mr. Sadok, Techit is granted incredible powers of intuition. Unfortunately, each time he fights one of Sadok's Opapatika enemies, the detective loses one of his normal five senses and, like his fellow tortured souls, quickly discovers immortality is torture.
Putthipong “Leo Putt” Sriwat plays Techit, with Somchai Khemklad, Shahkrit Yamnarm, Ray MacDonald and Atip Nana as the four Opapatikas he alternately fights and allies with. Veteran actor Nirat Sirichanya is Sadok, while Pongpat Wachirabunjong is Sadok's chief enforcer, who leads an army against the Opapatikas. He also serves as a helpful narrator. "Cherry" Kemaupsorn Sirisukka is a mysterious, ethereal woman.
Released in 2007, Opapatika was Thanakorn's sophomore feature, following the romantic drama Fake. Opapatika was featured on the festival circuit last year, including the Deauville Asian Film Festival, Hong Kong and Puchon. It was also a Subhanahongsa nominee for makeup and special effects, as well as best production design at the 2nd Asian Film Awards.
The Region 1 release by Magnolia is, I believe, the first chance to get it on DVD with English subtitles.