One factor that can increase employees' innovative work behavior (IWB) is knowledge sharing (KS) behavior. KS behavior is very dependent on individual employees. This research aims to explore the relationship between KS behavior and IWB. The proposed research model was constructed based on social cognitive theory and planned behavior theory consisting of perceived social pressure and personal factors, KS attitude, KS intention, KS behavior, and IWB. This research utilized 604 data from middle management and frontline employees of textile companies. The data processing was performed by structuring both Structural Equation Modeling and Multiple Indicator Multiple Causes (MIMIC) model. The results showed that KS behavior could increase employee IWB and psychological ownership of knowledge could positively affect employees' KS behavior. In addition, education level and work experience also have a positive effect on employees' KS attitudes.