This paper presents the design of an ECC-based secure communication protocol built on discrete mathematical structures for 6G Wireless Sensor Networks (WSNs). The framework leverages optimized elliptic curve operations over finite fields to enable lightweight encryption, secure key exchange, and reliable authentication in resource-constrained environments. By utilizing the hardness of the Elliptic Curve Discrete Logarithm Problem (ECDLP), the proposed protocol ensures strong confidentiality, integrity, and forward secrecy. The design focuses on reducing computational overhead, communication cost, and energy consumption, making it suitable for large-scale sensor deployments. The protocol supports scalable and efficient security mechanisms, addressing the challenges of massive connectivity, low latency, and heterogeneous devices in emerging 6G networks.