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Islamic banking continues to show significant development, however the interest of the public to save in Islamic banks is still a question for the predominantly Muslim community of Sinjai. One of the reasons is that the public perception of Islamic banks has been formed for a long time, making it difficult to change. Moreover, public knowledge regarding Islamic banks is still very limited. In addition to perception and knowledge, there are other factors that also affect interest in saving, namely religiosity and subjective norm attitudes. Every individual has varying degrees of religiosity, so this can affect the extent to which one is influenced by subjective attitudes and norms. The issues in this study are Does the perception of the community affect the interest in saving in BSI Sinjai branch using Planned Behavior And Reason Action approach, Does religiosity affect the interest in saving in BSI Sinjai Branch using Planned Behavior And Reason Action approach, Does knowledge affect the interest save at BSI Sinjai branch by using the Planned Behavior And Reason Action approach, Do the variables of perception, religiosity, and knowledge simultaneously positively influence saving interest in BSI Sinjai Branch by using the Planned Behavior And Reason Action approach? The purpose of this study is to find out the influence of perception, religiosity, and knowledge on saving interest in Sinjai Regency BSIs by using Planned behavior approach. this study can be used by BSI management to design more effective marketing strategies. By understanding how societal perceptions, religiosity, and knowledge affect interest in saving. This study falls under the category of quantitative research, and data analysis was conducted using the SEM (Structural Equation Modeling) test method. The population in this study is all the Sinjai Community, the sample used in this study used the method of incidental sampling Technique hence the researcher sample of 100 people in this study. As for the hypothesis in this study Persesion has a Significant influence on interest in saving in BSI Sinjai branch by using Planned Behavior And Reason Action approach,in addition religiosity also contributes significantly to Decision to save in BSI, Knowledge about syariah banking products plays an important role in increasing interest in saving, especially among communities with financial literacy levels which is good. According to the hypothesis this provides insights for BSI management to design more effective marketing strategies and educational programs to increase public participation in shariah savings products.