Sleepstalker

Seventeen years after slaughtering all but one member of a family, a vicious serial killer known only as "The Sandman" awaits execution. But first his jailers allow a minister to visit the killer to give him last rites, unaware that the minister is a voodoo priest and an ally of the condemned prisoner. The priest places a hex on the Sandman and his soul ends up migrating into a body made of sand.