Sandplay therapy helps the person develop social skills and acts as a therapy method where they can reflect and repair their inner world. This study aims to test the feasibility of sandplay therapy method in an open area for children with autism spectrum disorder (ASD) and investigate its effect on the development of social skills. In addition, the reorganization of sandplay areas where children with disabilities receive education and treatment, and the introduction of design proposals for integrating them with sandplay therapy in the open area, have been one of the other objectives of this study. The study group of this research, has a quasi-experimental design in which pre-test and post-test measurements are made on the experimental groups of children between the ages of 8 and 12 years with autism diagnosed were formed. This research consisted of five stages: the planning of the study, the implementation phase, the post-tests, the analysis of the data and the explanation of the design proposals. As a result of the studies conducted on children with ASD, increasing their interaction with society contributed to the development of children with autism socially and psychologically. In this context, group sand therapy was applied to the experimental groups for 7 weeks, one session a week and a total of seven sessions of two children with autism were selected using the selective assignment method. The effect of open area sandplay therapy method on the development of autistic-disabled people was compared with the values taken before and after the sandplay therapy sessions. The findings revealed that increasing interaction with society contributed to the development of children with ASD socially and psychologically. In addition, the development of suggestions for the design of barrier-free sandplay areas and the evaluation of the connection between sandplay therapy and design in the open area was made.