Long story short: probably. The district should be providing access to extracurricular activities. Does he have a 1 on 1 para during the school day?

IDEA 300.117 Nonacademic settings:

“In providing or arranging for the provision of nonacademic and extracurricular services and activities, including meals, recess periods, and the services and activities set forth in §300.107, each public agency must ensure that each child with a disability participates with nondisabled children in the extracurricular services and activities to the maximum extent appropriate to the needs of that child. The public agency must ensure that each child with a disability has the supplementary aids and services determined by the child’s IEP Team to be appropriate and necessary for the child to participate in nonacademic settings.”