Many More Modern orthodox schools are more equipped to handle special education and many do have resource rooms, but it still doesnt mean he belongs there. However every Special education child is different and there are a broad range where they are and without reading the IEP its impossible to know where he is on the scale.
A Yeshiva like Darchei might actually be a terrible place for him, if he has seriosus issues and cannot really learn properly he will get frustrated and may even act out and a Rebbe who is not qualified to teach a special needs child will unduly punish him and make it worse.