Purpose: Evidence-based interventions (EBIs) are essential to improve the well-being and neurocognitive outcomes of pediatric cancer patients; however, considerable barriers hamper the implementation of these tools. The present study assessed health care professionals’ (HCP) perceived barriers and facilitators to the implementation of a specific EBI for pediatric oncology in a standardized manner to define effective solutions and practical recommendations. Methods: An adapted version of the Consolidated Framework for Implementation Research (CFIR) questionnaire was applied to inquire n = 31 HCPs in pediatric oncology about the five domains of implementation. Results: While most ‘intervention characteristics’ were considered beneficial for implementation, various aspects of the ‘inner’ and ‘outer setting’ were considered problematic. The most prevalent barriers included a shortage in resources, poor integration of EBIs into policies and lacking incentives such as user benefits. Concrete proposed and realized steps to facilitate effective implementation include a patient-focused design and continuous evaluation and adaption of the tool, a detailed EBI user manual and application workshops, as well as regular interdisciplinary meetings to improve communication. Regarding the internal and external settings, involving policy makers, establishing psychosocial care in the insurance system and increasing awareness by sharing evidence are essential steps for improved implementation. Conclusion: Based on standardized implementation evaluation, various targeted actions could be defined and implemented to facilitate successful implementation of EBIs in pediatric oncology. The results emphasize that psychosocial care must become an integral part of treatment standards and public health policies to ensure that effective psychosocial interventions for improved wellbeing and neurocognitive skills successfully reach pediatric cancer patients. Trial registration number: ClinicalTrials.gov Identifier: NCT04474678 (July 17th 2020).