The aim of this study was to determine the effect of psychoeducational group study regarding self regulation in learning on motivational beliefs and academic success of students. Pre and post tests with control group design were used in this study. Participants of the study consisted of 10th grade students at Anatolian High School. "Motivational Strategies Scale at Learning" and "Information Form" which prepared by author was used for data collection. ANOVA and ANCOVA models were used for analyzing of study data. The results of study showed that psychoeducational group study which was given to treatment group during 8 weeks increased motivational beliefs and academic success level of students. Increase of motivational beliefs did not differentiate in terms of gender and study field of students. The results of study were discussed depending on the related literature.