The purpose of this study was to examine the effect of the football play on the social development of children with developmental disorder. Subjects in this study were three children with developmental disorder in an educational institute for those children in D-metropolitan. They had difficulties in self-concept and human relations in social development. A football play was individually conducted 12 times for 12 weeks. The findings of this study were as follows: First, the football play improved three children's play with other children and adults. During the training, an increasing frequency of plays occurred to only two of three subjects, but one remained unaffected. Second, the play football training improved two children's relationship with their parents, siblings, other children and other adults, but one had no significant improvement. Third, the play football training decreased three children's inappropriate behaviors, such as insistence on the sameness, tantrum, self-injured behaviors, while it increased following instructions, spontaneity, concentration, adaptative and spontaneous behavior to the group. It was discussed that children's disorder symptom experienced a variety of physical activity in the play football training, that the experience might affect their interests in play. Finally they could initiate play for themselves and responded to others demands for play, that children disorder might have more interests in other people and increase the initiation of social interaction and responses to other's demands, as they became competed and cooperated with playmates through the play football training.