Ex-NFL Linebacker -- Arrest Warrant Issued ... Deadbeat Dad to Special Needs Kid

Ex-Indianapolis Colts linebacker Clint Session is a wanted man -- a judge has called for his arrest for failing to fork over roughly $400k for the care of his special needs daughter.

Session -- who reportedly got an $11 MILLION signing bonus from the Jags in 2011 -- was previously ordered to pony up child support to his ex to help pay for his daughter's vast medical bills.

FYI, Session's 4-year-old is a quadriplegic who's been diagnosed with cerebral palsy and brain damage. She has serious vision issues and can't eat normal food.

Session's ex says ... despite a court order, the 31-year-old has refused to pay child support, medical bills, therapy bills and other fees ... totaling up to more than $381,000.

The judge in the case has had enough -- and gave Session an ultimatum ... pay up or go to jail.