Introduction. Parents of children with sensory processing issues (SPIs) experience decreased levels of parental sense of competence (PSOC) in managing SPI-related behaviours that challenge conventional parenting skills. Occupational therapy (OT)-led parent education workshops (PEWs) have been found to increase the PSOC of parents of children with SPIs who have a formal Autism Spectrum Disorder (ASD) diagnosis. However, research is limited on how these interventions affect PSOC of parents of children with SPIs who do not have a formal diagnosis, and are still on the waitlist for a neurodevelopmental assessment. This is vital as children with SPIs and their parents may have limited access to specialist referrals, government-funded interventions, or support services while they await a diagnostic assessment. SPI-related workshops may provide an opportunity to support families and promote PSOC and well-being by providing strategies to address SPI-related behaviours while they wait (which may be beneficial regardless of whether their child eventually receives a formal neurodevelopmental diagnosis or not). Objectives. The primary objective of this pilot randomized waitlist control trial is to evaluate the impact of an OT-led parent education workshop on the PSOC of parents of children experiencing SPIs who are on the waitlist for a neurodevelopmental diagnostic assessment. The secondary objective is to obtain a subjective evaluation of the content, format, and delivery of the parent education workshop from the parents' perspectives. Methods. Parents will be recruited from the waitlist for a neurodevelopmental assessment for their children through the "Communication, Learning, and Behaviour" clinic at Holland Bloorview Kids Rehabilitation Hospital. Participants will be randomly selected to attend one of two identical workshops scheduled two weeks apart. The PSOC Scale, along with demographics and follow-up questionnaires that include both closed and open-ended questions, will be administered to parents pre- and post-workshop attendance. Descriptive statistics, an independent sample t-test and a two-way Analysis of Variance (ANOVA) will be used to analyze quantitative data from these outcome measures. To analyze the qualitative data (parents' open ended responses on the follow-up feedback questionnaire), a content analysis will be completed, which will be used to complement the quantitative results, as well as provide feedback regarding the content, format, and delivery of the parent education workshop. Practice Implications. Results from this study can provide evidence to support the need for parent education workshops in improving the PSOC of parents of children on the waitlist for a neurodevelopmental assessment, promote mental health and wellbeing of parents while they wait for the assessment, promote parenting that helps children with SPIs engage in daily life occupations, and inform the development of future workshops. Conclusion. Information garnered from this study can inform the development of OT services that can address the current gap in care while parents and their children with SPIs are waiting for a formal neurodevelopmental assessment and referrals to publicly funded services funded for specific diagnosis.