5G networks are rapidly being deployed, providing high speed and low latency, promoting many new applications. However, the deployment faces several technical challenges. The complex 5G architecture, with virtualisation and network partitioning, increases the attack surface, exposing security vulnerabilities such as insufficient partition isolation and backwards compatibility with older network generations (such as 4G and 3G networks). The roaming environment is a significant security weakness, potentially exposing information and impersonating user subscribers. Since 5G is the foundation for critical future applications, simulating the 5G Roaming environment is necessary to research and test information security solutions. In this paper, we propose a 5G network data roaming simulation model with basic functions for research and testing information security solutions. The model has been tested and evaluated for performance in a laboratory environment to ensure that its parameters are as close as possible to those of an actual 5G network deployment.