The N-Sand Table, a multi-user interactive virtual sand table system based on Neural Radiance Fields (NeRF) technology, is proposed to address the issues of weak interactivity, severe standalone operation, difficulty in constructing map models, and challenges in meeting multi-user remote planning needs prevalent in traditional virtual sand tables. Utilizing NeRF technology with real-world image data, this system creates highly realistic virtual sand tables and employs intelligent algorithms to dynamically adjust the terrain, achieving a high degree of user customization and interactivity. Moreover, the system enhances user interaction convenience by supporting multi-channel interactions through gestures and voice, and facilitates real-time remote interaction among multiple users. Experimental results demonstrate the system's excellent performance in terms of interaction real-time and stability, effectively supporting multi-user remote collaborative planning.