Cyber ranges (CRs) are interactive platforms that simulate networks, systems, and attack-defense exercises, along with security testbeds and cyber-physical ranges. The latter systems are preferred for cyber-physical systems scenarios due to the variety of heavyweight simulation environments and potential hardware integration required for such exercises. Current implementations face challenges such as interoperability gaps due to diverse protocols, limitations in scalability, scenario design, resource sharing, and a lack of shared architectural information. As a conceptual design paper, taking into account the CR challenges, architectural trends, and reference architecture guidelines, we propose the adoption of service-oriented architecture (SOA), a software design approach in which software components are designed as independent, reusable services that communicate with each other over a network. By leveraging SOA principles and its reference architecture directions, we present a high-level architecture of a cyber range that could address CR issues, along with its benefits, open challenges, implementation guidelines, and evaluation strategy.