Knowledge, skills, and attitudes to manage sustainable development have become significant components of different career paths. Previous research has explored which competencies are needed for future change agents in the field of sustainable development. Sustainable entrepreneurship can be seen as a promising work context in which these competencies are truly at the forefront and enacted. Several researchers have compiled frameworks of key competencies. However, their work is exploratory in nature and a more in-depth analysis of these frameworks is called for. In this study, an existing competence framework for sustainable entrepreneurship was tested in terms of construct validity, among 402 would-be entrepreneurs. The results suggest the inclusion of six competencies, which constitute a competence framework with a good model fit. Furthermore, a new combination of two existing competencies is proposed. This study has important implications for the debate on which competencies for sustainable entrepreneurship are essential on theoretical and empirical grounds.