This quasi-experimental study examines the effectiveness of a psychoeducational group intervention program consisting of psychoeducation sessions and group exercises based on psychodrama warm-up activities resulting from the needs of public sector call center agents in the workplace. Forty municipality call center employees from two municipalities (intervention and control groups) completed pre- and post-test measures before and after the intervention program. Within the scope of the study in sociodemographic form, the Brief Psychological Resilience Scale (BPRS), Maslach Burnout Inventory (MBI), Warwick-Edinburgh Mental Well-Being Scale (WEMWBS), Organization-Based Self-Esteem Scale (OBSES), Group Cohesion Scale (GCS), and Group Atmosphere Scale (GAS) were used. A follow-up session and follow-up test for the intervention group took place one month after the completion of the intervention sessions. The intervention group showed significant pre-to-post-test short-term effects on psychological resilience and pre-to-follow-up long-term effects on group atmosphere scores. However, there was no significant change in burnout, well-being, or organization-based self-esteem scores. Moreover, no significant difference was noted in the control group from pre- to post-test, except for the decrease in the group atmosphere scores.