In today’s interconnected world, achieving the Sustainable Development Goals (SDGs) as set by the United Nations (UN) requires innovative solutions to bridge the existing digital divide and ensure equitable access to information and technology. Connectivity, facilitated by communication technologies, plays a crucial role in driving progress across all 17 SDGs, from creating new job opportunities to ensuring environmental sustainability. However, traditional terrestrial networks face limitations in reaching remote and underserved areas, hindering efforts to achieve these goals. In this context, Vision 2030 of the Kingdom of Saudi Arabia recognizes connectivity as a vital catalyst for transformation. By prioritizing advanced telecommunications infrastructure and embracing emerging technologies, the country aims to enhance digital access nationwide. Non-terrestrial networks (NTN), such as satellites, airships and drones, offer promising solutions to extend connectivity to these regions. By integrating NTN with 5G and beyond-5G (B5G) terrestrial networks (TN), we can create a diversified connectivity framework that provides widespread, reliable, and low-latency communication. This approach is essential for bridging the digital divide, enhancing access to healthcare, education, and economic opportunities, and improving disaster response efforts. In this paper, we examine the challenges Mobile Network Operators (MNOs) encounter in integrating NTN with 5G and B5G TN options. In response, we present a novel reliability-diversified design within the framework of Space-Air-Ground Integrated Networks (SAGIN) and demonstrate its transformative potential as a catalyst for achieving the SDGs in Saudi Arabia.