The potential life state of another region of the universe would have to be sacrificed for the entropy effect of the one galaxy to be suppressed. Should this occur it would not ultimately eliminate entropy. Decay would begin again at the exhaustion of the energies provide by the sacrifical entity. This thermodynamic condition is vividly expressed in the Bible as an unalterable condition except for the intervention of a power that can supersceed it. This same Bible that explains the facts of decay gives the explanation for it's cause.
Sin is more a condition of cause than it is the cause itself.
There was a time when the laws of thermodynamics were not an active influence. There was a time when no aging process was in effect. And that same condition is predicted to return again. God cursed this earth, this universe by the disobediance of the first human beings. The questions of why and how may come to mind regarding a curse.