Physical inactivity is considered a pandemic, requiring strong policy responses to address this major health issue. However, research on the development of Health-Enhancing Physical Activity policies (HEPA) remains scarce, particularly at the local level. There is a need to produce evidence to better understand the process to develop local HEPA policies. This study aims to model the development of HEPA policy promotion in French municipalities from empirical data and policy science theories. This research was undertaken in three steps: (1) assess the level of development of HEPA policies from 10 French municipalities using a local HEPA analysis tool, (2) provide a brief overview of core political science theories applied in health promotion, and (3) from these empirical and theoretical perspectives, model a conceptual framework to better understand the development of HEPA policy promotion in French municipalities. Based on empirical data and the Multiple Streams, policy cycles and Institutional Rational Choice theories, a conceptual framework of the development of municipal HEPA policy promotion was modeled. This conceptual framework is comprised of five stages describing the development of municipal HEPA policies. This paper contributes to a better understanding of the development of municipal HEPA policies.