Technology education in primary schools must integrate sustainable development to provide young learners with the basic knowledge, skills, and values to understand, appreciate and contribute to a sustainable future. This integration prepares them for the challenges of a rapidly changing world, promotes responsible use of technology and fosters a sense of environmental responsibility from an early age. However, for this to happen, teacher education needs to adopt strategies that empower student teachers to seamlessly integrate sustainable development into technology education and equip them with environmentally and socially responsible attitudes. The aim of this study is to explore what needs to be addressed in teacher education to prepare student teachers to teach technology integrated with sustainability. The study is part of a project where to develop a teaching module that will prepare student teachers to teach technology in primary schools, with special attention to how student teachers develop relationships between technology education and sustainable development. The study includes 12 student teachers enrolled in a science and technology course. Data were collected in several steps, including focus group interviews, and written individual reflections by student teachers. Based on thematic analysis, we identified what student teachers experience as crucial to being able to teach technology with a sustainability edge. The results show that preparing student teachers to teach technology with a sustainability edge requires a multifaceted approach that integrates knowledge of technology and sustainable development with personal values, pedagogical competence, critical thinking competency, and the adoption of transformative teaching practices.