Background: The Chronic Disease Self-Management Program (CDSMP), grounded in selfefficacy theory, incorporates 13 self-management tools aimed at improving participants’ health behaviors through structured action planning. This study aimed to evaluate the effectiveness of the CDSMP on health outcomes and daily functioning in patients with schizophrenia. Methods: A total of 80 participants diagnosed with schizophrenia were randomly assigned to either an experimental group (receiving a six-week CDSMP course) or a control group (receiving routine psychiatric care). Outcomes were assessed using the Stanford Self-Management Questionnaire (SSMQ) and the Activities of Daily Living Rating Scale III (ADLRS-III), administered before and after the intervention. Results: The comparison between the experimental and control groups on the items of the SSMQ did not reach statistical significance (p = 0.131-0.988). For three items of the SSMQ (shortness of breath, stress, and visits your doctor), small effect sizes were observed (success rate difference = 0.16-0.23). A statistical significance was found in the ADLRS-III between two groups (p = 0.008) with moderate effect size (Cohen’s d = 0.61). Conclusion: Participation in the CDMSP may effectively basic and instrumental activities of daily living in patients with schizophrenia. The CDSMP may have help alleviate perceived stress and to enhance preparedness before medical visits. Overall, this study suggests that the program may have potential benefits in strengthening self-care in patients with schizophrenia.