Offenders with mental illnesses face challenges in achieving successful reentry into the community both during and after the probationary period. Unsuccessful reentry is linked to worsening mental health symptoms and an increased risk of recidivism. In response to this issue, this study aims to propose collaborative partnerships between the Ministry of Justice and community social resources to enhance the successful reentry of offenders with mental illnesses. A survey was conducted on 233 probation officers and 55 mental health specialists. The results indicate that while offering various social reentry supports (e.g., economic and medical assistance) to offenders with mental illnesses is beneficial, probation officers may encounter difficulties stemming from low offender motivation and a lack of collaboration with social welfare agencies. Based on these findings, the study suggests the implementation of a framework termed the “intensive integrated case management task force,” to be independently operated by the Ministry of Justice. This framework is anticipated to address challenges and contribute to successful community reentry, rehabilitation, recidivism prevention among offenders with mental illnesses, and overall community safety.