are there government programs for special needs kids in English?
No. Nothing of that sort exists. Any programs would be exclusively in Polish. There is a long wait list for public programs, and you would not be able to afford private care.
I will be getting 90000 pln per year.. what's the cost of special needs program there?
That is too little for a couple with a special needs child to live on in Poland. You would have difficulty even if the child did not have special needs. Even if you did manage somehow to cover your basic living expenses, that would leave you with essentially zero left over to put in your savings account. You wouldn't be able to scrape together even a modest rainy day fund.
You are going to have to rethink this moving to Poland matter. Unless you are making substantially more money, there is no point.
By the way, 90,000 PLN works out to only about $20,000 US. While some things are cheaper in Poland, things related to children, especially foreign children, are quite expensive. With the cost of your relocation figured in, as well as the extra costs of a special needs child, you would be living a monkish, hand to mouth lifestyle, at best. Or you would quickly go bust hand have to leave empty-handed, with little more than the shirt on your back.
As for your spouse finding a job, forget about it. Just ain't gonna happen.
Sorry to rain on your parade, but your plan does not make any financial sense, or any other kind of sense.