The current research aimed to design a model for the development of green investment in sustaining entrepreneurial sports startups. The present research method is of the grounded theory type with a constructivist approach by Charmaz (2014). To gather the required information, a combination of library studies and semi-structured and in-depth interviews was utilized to identify the relevant components. The statistical population included environmental and green investment experts, entrepreneurship and startup specialists, sports and physical education experts, managers and entrepreneurs of sports startups, and sports management professors. Sampling was carried out purposefully using the sequential sampling method (15 participants). To assess the quality and credibility of the qualitative results, evaluation criteria proposed by Lincoln and Guba (1985), including credibility, transferability, dependability, and confirmability, were employed. The interviews were coded using MAXQDA software. The findings indicated the influential factors on the development of green investment in sustaining entrepreneurial sports startups, consisting of two infrastructure and technological dimensions (3 indicators: development of green infrastructures, development of green technologies, promotion of renewable natural resources), and cultural and behavioral dimensions (3 indicators: promotion of green culture, promotion of sustainable lifestyle, green financing). The results showed that the designed model for the development of green investment in sports startups can be used as an operational template for policymaking and planning in this field.