Coronary artery disease (CAD) poses a significant health risk to the global population and behavioural change theory intervention on lifestyle and physical activities are needed to improve patient's quality of life. Our main objective is to examine the application of behaviour change intervention program on the on the lifestyle and quality of life of patients after coronary intervention. The randomised controlled trial was carried at Fuawi Hospital consisting of 156 participants divided into control and intervention groups. The primary outcomes showed significant changes and increase in levels of physical activity between intervention and controls with the intervention group showing higher frequency, duration and intensity in both moderate physical activity and walking. Secondary outcomes showed significant reductions in the blood pressure, BMI, and improved healthcare-related quality of life. Alsos, significant lifestyle changes were observed with cessation of smoking, increased intake of healthy diets, stress and sleep management. Thus, the behavioural intervention change program was significant in improving the outcomes of CAD patients through increased levels of physical activity, increased quality of life and lifestyle changes.