Background: Child abuse is a pressing issue that impacts numerous children every year, resulting in significant behavioral effects both in the immediate and long run. Deprivation of physical, emotional, and social needs during childhood has been associated with a diverse range of mental health consequences over time. Offering training to foster caregivers is increasingly recognized as crucial for improving the overall success of foster placements. Psychoeducational interventions are typically prioritized in addressing emotional and behavioral challenges stemming from trauma and stress in children. This study aimed to evaluate the psychoeducational program impact on aggression and self-esteem among foster care children. Subjects and Method: 51 foster children, ages 6 to 12, both male and female, made up the study sample. The Hare Self-Esteem Scale, aggressive behaviors, and personal traits were applied. Results: The participants were mostly men. Compared to girls, foster boys had higher mean scores for physical violence. Conclusion: Between the pretest, post-test, and three months following the program's implementation, there was a highly statistically significant difference in all forms of aggressive behavior and self-esteem at (P=0.000).Recommendation: Consistently evaluating aggressive behavior and implementing psychoeducational interventions for foster children within the school setting is essential.