As with so many things in life, the answer is “it depends”. If you are talking about Social Security disability benefits it will depend upon the type of disability benefit you are receiving. Supplemental Security Income (SSI) disability benefits, which are for certain low income individuals e.g. – blind, aged, disabled and below certain income thresholds) who do not qualify for regular Social Security Disability cannot have their SSI payments garnished for child support. On the other hand, standard Social Security Disability payments can be garnished to meet child support obligations.
While it is much more complicated, it is also possible that a portion of VA disability benefits can be garnished for child support.
Finally, if you are receiving disability payments through an individual or group disability insurance policy those payments can be garnished for child support purposes though the specifics vary from state to state.