The purpose of this study was to develop a solution focused group program in a metaverse format to reduce delinquent behavior and improve social problem solving skills among middle school delinquents and to test the effectiveness of the group program. To this end, a solution focused group program for middle school students that can be conducted within an online metaverse was developed and implemented, and the results were compared with the results of a previously developed offline solution focused group program for middle school students. First, the subjects of this study were 60 male adolescents who were referred to a middle school in Chungcheongbuk-do for delinquency. Thirty adolescents were randomly assigned to the experimental group, an online metaverse based solution focused group program, and 30 to the comparison group, an existing offline solution focused group program. To determine the effectiveness of the group program, delinquent behavior, social problem solving skills, and emotional regulation were measured before and after each group program. The results showed statistically significant increases in social problem solving and emotional regulation in all groups from pretest to posttest, and significant decreases in delinquent behavior. In addition, satisfaction with the group therapy was statistically significantly higher in the experimental group than in the comparison group. These results suggest that the online metaverse based solution focused group program is a viable substitute for traditional offline solution focused group program. Online metaverse based solution focused group program may have advantages over traditional offline group program in terms of space constraints, affordability, and interest.