There are numerous kinds of disability compensation and benefits, and some may be considered as income for alimony purposes. Social security disability and retirement benefits, for example, may be subject to assignment or levy to enforce support obligations (5 CFR § 581).
Worker disability benefits, too, may also be considered for alimony, but there is usually a limit set either by law (25% or less) or by the court as to the amount that can be assigned for child or spousal support.
Disability pay for spousal support is very complex and would require the advice of an expert in order to fully understand it. It would be best to consult with a lawyer who is an expert in spousal support to be properly guided on the appropriate course of action to take.