Internet-based therapies have emerged as effective alternatives to traditional face-to-face therapies, demonstrating efficacy in treating mental health problems and providing accessible care, especially in this post-pandemic world. Moreover, the unique characteristics of the Internet offer promising opportunities to cater to the unique requirements of patients diagnosed with Autism Spectrum Disorder (ASD) , emphasizing profound impact that can be achieved through internet-based therapy in revolutionizing existing therapeutic paradigms. However, investigation of online therapy for adults and older individuals with ASD is currently limited. This systematic review provides a summary of the status of existing research investigating the application of Internet-based therapies on individuals with ASD, including Virtual Reality-based interventions, Artificial Intelligence-based interventions and other online therapies. The primary objectives are to assess the efficacy of Internet-based therapies as treatments for individuals with ASD. Additionally, potential differences between Internet-delivered therapies and traditional face-to-face therapies are also being explored. By providing a comprehensive analysis of both Internet-based and traditional therapy modalities, this review aims to contribute to our understanding and delivery of more effective therapeutic options available for individuals with ASD. Future directions on better therapeutic choices are discussed, as well as the need for addressing the existing research gap towards elder population.