Self-management of chronic kidney disease (CKD) is crucial for health outcomes. This study was conducted to demonstrate the effect of a self-management programme based on Bandura's self-efficacy theory offered to patients receiving peritoneal dialysis (PD) on behavioural changes regarding hand-washing/mask-wearing and self-efficacy level. In this study, the pretest-posttest design was used without a control group. The sample of the study consisted of 30 patients who were receiving peritoneal dialysis. At the first interview conducted with patients, patients were given a Questionnaire Form on Socio-Demographic and Disease Characteristics and the Self-efficacy Scale. Following the 6-month self-management programme; the self-efficacy scale was applied again and the effectiveness of the self-management programme was evaluated by re-asking the questions on hand-washing and mask-wearing behaviours, and the two questions on the presence of peritonitis and leucocyte abnormality. The self-management programme in question in this study was comprised of multidisciplinary team collaboration, telephone contact, clinic interviews, use of reminders, training intervention based on Bandura's self-efficacy theory and enhancement of self-efficacy. A statistically significant difference was found between the pre-intervention and post-intervention self-efficacy scale mean scores of patients (t: -4,396, p < .001). In this study, it was found that the self-management programme based on Bandura's self-efficacy theory caused a positive change in the hand-washing/ mask-wearing behaviours of patients and that it improved the self-efficacy level.