Modern schools face numerous challenges. They need to teach children about the need for sustainable development. Thus, school buildings and premises should be designed as living examples of the pursuit of sustainability. Moreover, green school grounds have the potential to become health-affirming landscapes. This paper discusses the close relationship between the concept of health-affirming everyday landscapes and sustainability in modern energy-efficient school design. In the first part of the paper, a literature review concerning the concept of health-affirming landscapes for children and teenagers and sustainability in school design is presented. In the second part, selected case studies of new energy-efficient schools in Poland and France are examined.