As a new approach to economic development, sustainable entrepreneurship—also known as entrepreneurial modeling for sustainable development—aims to practice the triple bottom line, encompassing economic profitability, social responsibility, and environmental protection. The financing of sustainable businesses in a world marked by crises such as climate change, poverty, and social inequalities is a significant challenge. The purpose of this chapter is to identify and analyze the existing mechanisms of finance for sustainable entrepreneurship, including traditional finance, venture capital, microfinance, and social investment, as well as their limitations in supporting the needs of sustainable entrepreneurs. Key challenges include cultural, economic, and political issues, as well as poor access to financial resources and a lack of transparent data. It then proposes ways to take the path, for instance, through the use of blockchain technologies, the crowdfunding model, and the roles of governments and international institutions in pursuing this path. The Grameen Bank and Patagonia case studies demonstrate how equally innovative financial models can contribute to social empowerment, build stronger economic resilience, and protect the environment. In this chapter, the recommendations to policymakers, researchers, and investors stress the desirability of more humane, transparent, and responsible financial instruments for development to be more widely sustainable globally.