Group Psychomotor Therapy (GPT) has a positive effect on the development of pre-school age children. GPT is prescribed for children with behavioral problems and has been used to enhance motor competence. The purpose of the study was to examine the effect of a GPT on the self-perception of ability and social acceptance of children 5-6 years of age. In the survey participated, 81 children aged 47-72 months attended private Kindergartens in Ioannina, Greece. The sample was assigned to the Experimental Group (EG), which participated in the GPT program, and the Control Group (CG), which did not participate in any intervention program. Children were measured with the Pictorial Scale of Perceived Competence and Social Acceptance (PSPCSA) in the Greek version. According to the results, children of the EG presented higher improvement in self-perception of ability and social acceptance compared to those of the CG. GPT plays an important role in the child's development and is recommended in schools and kindergartens. The results confirm that GPT affects emotional profile but also the reduction of behavior problems. It is important to include GPT in the prescription procedure within the Greek Health System to provide additional support in traditional methods and treatments.