This study examines the impact of an auditory integration-based developmental support programme on the sensory development and self-regulation skills of children with autism aged three to five years in Turkey. This mixed-methodology research combined quantitative and qualitative methods, and data were collected using a general information form, the individual needs determination form, the adapted autism behaviour checklist (ABC), the Gilliam autism rating scale-2-Turkish version (GARS-2-T), the sense and self-regulation checklist (SSC) and semi-structured interviews. An AB model was used to determine the effectiveness of the auditory integration programme in supporting the sensory and self-regulation skills of children with autism. The quantitative data were graphically analysed, while the qualitative data underwent content analysis. The findings establish that the children's final evaluation results were lower than their initial assessments, signifying that the intervention had a positive impact. The qualitative data obtained from interviews with the participating children's mothers concurred with the quantitative results, and the mothers expressed favourable views regarding the programme.