This study introduces an innovative approach to enhance marketing and sales processes within an energy services company operating in Colombia. Through the integration of Lean Six Sigma and System Dynamics simulation, we aimed to optimize efficiency and drive impactful improvements. Lean Six Sigma principles were applied to existing marking and sales operations, identifying bottlenecks, and an improved process was proposed. System dynamics is utilized to simulate and evaluate the potential impact of the proposed process, and found that sales can be increased by 50.84%, revenue can increase by 60.19%, and closing effectiveness can increase by 70.22%. The results indicate the benefit of utilizing engineering management tools in sales environments and provides a framework for decisionmakers to adopt and further enhance business environments thus fostering sustainable practices.