The objective of the present current research  is related with the verification of mediating role of green employee behavior between green training and green employee involvement behavior on environmental performance in service sector of Sindh, Pakistan. The data gathered with help of adopted questionnaire from past studies and service sector employees were requested to fill the printed questionnaire face to face. In order to test the proposed hypothesis structural equation modelling (SEM) is applied in SmartPLS version 3. Total 200 cases considered in the present study. Findings confirmed direct effect of all variables including of green training and green employment behavior on green employee behavior. Similarly, the direct effect of green employee behavior on environmental performance in service sector of Sindh, Pakistan. Furthermore, the indirect effect of green employee behavior between green training and employee involvement behavior on environmental performance also confirmed as a partial mediation effect. The study found that green training has a significant, positive impact on how green employees act, impacting how well the environment is protected. Because of this, managers should make it a priority to give their workers thorough green training programs. The main goal behind these programs is teaching the people about sustainable practices, the environment, and how important it is to act green at work and workplace.