Background and Objectives: Inadequate pain treatment in pediatric patients can cause long-term physical and psychological issues. Accurate detection of pain presence and intensity is crucial, especially in Neonatal and Pediatric Sub-Intensive Care Units. Due to uncertainties about the best pain assessment tool in these settings, it is necessary to review the literature to identify the available evidence. Methods: A scoping review was performed to address the question: What tools are available for pain assessment in non-sedated, non-intubated pediatric patients in sub-intensive care? Searches were conducted in databases including PubMed, Scopus, Embase, CINAHL, Cochrane Library, Web of Science, Open Dissertation, as well as CENTRAL and ClinicalTrials.gov registries. Results: The review included 27 studies, revealing various tools for pain assessment in pediatric sub-intensive settings. All studies favored the use of multidimensional scales, combining physiological and behavioral indicators. Conclusions: This review offers a comprehensive overview of the tools for pain assessment in pediatric patients in sub-intensive care settings but does not determine a single best tool. Most studies focused on the validation, translation, and adaptation of these tools. Further research is needed on the practical application of these tools and the perceptions of those administering them.