This research aimed to examine effects of the group art therapy using clay on the fine motor skills and sociality of young children. Among 40 young children, 24 young children whose parents consented and who wanted to participated in this research were randomly selected and evenly divided into the experimental group of 12 young children and the control group of 12 young children. A total of 12 sessions of the program, not counting pre- and post- tests were conducted once or twice per week for 60 minutes at a time. PDMS and K-SSRS were used. The results of this research are summarized as follows. First, the scores of fine motor skills of the experimental group were enhanced with statistical significance in the domains of the following functions: learning function, living play function, speediness and sophistication, visual exercise coordination, reaction speed, and hand functions. Second, the scores of sociality of the experimental group were more enhanced with statistical significance in coordination, assertiveness, and self-control domains. Third, the young children became sufficiently able to express details of work with enhanced hand functions through kneading clay as the session progressed. Also, better sociality was observed as this group activity caused dynamics between young children. Accordingly, the results show that the group art therapy using clay enhances fine motor skills and the sociality of young children.