The article aims at designing the coherent and sustainable system of school leadership development in Lithuania. The article provides a theoretical insight on main principles of sustainable education that could be implemented in the system of school leadership development. Hence the organization of school leadership development system is highlighted in two aspects: as a requirement to ensure that leadership development process is coherent and is adjusted to school leaders needs at different stages of their career as well as the need to provide opportunities for aspiring, newly-appointed, and established leaders to acquire and develop the skills and competences necessary to accomplish leadership tasks. It is emphasized in the article that the principles of sustainable education make a premise for optimization of the system of school leadership development in Lithuania.