The present study aims to determine the effectiveness of Sandplay Therapy in the development of social skills and reduction of aggression in children under the age of 6 in the city of Bandarabbas. This is a quasi-experimental study with control group. 30 children under the age of 6 were selected using available sampling method. The training program of sandplay was implemented on the experimental group during ten one-hour sessions. Applied tools in the present study were Children’s Social Skills Questionnaire of Gresham and Elliott, parents’ form and Children’s aggression scale. Collected data were analysed using statistical method of analysis of covariance (ANCOVA). The results showed that sandplay training increased the average rating of social skills of experimental group in post-test. Also sandplay training reduced the average rating of behavioural problems and total score of aggression in experimental group. This means that sandplay training has significantly led to the increase of social skills and the reduction of behavioural problems and aggression rating in children under the age of 6 in the city of Bandarabbas in Iran. In a general conclusion, it can be said that sandplay therapy has an important impact on the reduction of aggression in children. Therefore, it is necessary to pay attention to this issue in behavioural interventions for children.
