This randomized controlled trial evaluated the effectiveness of a 12-week home-based transitional cardiac telerehabilitation (Hb-T-CTR) program on health-related quality-of-life and therapeutic self-care in older adults' post-Coronary Artery Bypass Grafting (CABG). The intervention group (n = 57) underwent Hb-T-CTR, incorporating preoperative counseling, postoperative education, a culturally adapted video, home visits, and telephone counseling, while the control group (n = 61) received standard care. Using the Coronary Revascularization Outcome Questionnaire and the Sidani Doran Therapeutic Self-Care Measure, data were collected at three time points. Results showed significant improvements in overall scores for both health-related quality of life (t(1)=3.386, P = 0.001; t(2)=4.224, P < 0.001) and therapeutic self-care (t(1)=7.104, P < 0.001; t(2)=4.242, P < 0.001) in the intervention group compared to controls. This telehealth approach provides convenient and accessible rehabilitation services for older adults' post-CABG and highlights the importance of integrating Hb-T-CTR into routine care for personalized rehabilitation. This study underscores the potential of telehealth tools in overcoming barriers and enhancing patient-centered interventions.