When a judge or magistrate in divorce or family court rules that you must pay alimony, they have issued you an order. You must pay or you are in indirect civil contempt of court.
If you have circumstances which do not allow you to pay alimony, such as extreme financial difficulties, make a formal showing of that to the divorce or family court. Provide paperwork, such as your credit report and your pay slips. Use formal written statements to explain why you are not making enough to pay alimony.
In Indiana, a person must be "guilty of any willful disobedience of any process, or any order lawfully issued" in order to be found guilty of contempt of court.(Ind. Code § 34-47-3-1 : Indiana Code - Section 34-47-3-1: Disobedience of process). So if you are
dilligently looking for work and filling out applications and are still unable to find a job, the judge may find that you inability to pay is not "willful disobedience".
So you need to look for work in as many places as you can and fill out applications. Keep a list of all the places you apply and get a copy of your application to show to the judge to prove that you are actively looking for work. It will be difficult for the judge to hold you liable if you are acting in good faith and putting your best efforts into finding a job, but you simply haven't received any offers.