As the integration of Smart Safety technology into industrial sites accelerates, driven by the Fourth Industrial Revolution and digital transformation, the safety management paradigm is shifting toward a data-driven intelligent framework. While these advancements contribute significantly to reducing critical disasters, they also introduce new cultural challenges, including technological dependency, digital fatigue, and privacy concerns. The existing human-centered Korean Safety Culture Index (KSCI) faces clear limitations in diagnosing these evolving characteristics of a smart safety culture. To address this gap, this study develops the "KSCI-SMART" (KSCI Extended Index), which aligns with government policy directions and comprehensively reflects technology-based characteristics. Through an extensive literature review, an integrated model was designed by adding the key variable of smart safety technology while maintaining the original KSCI structure. This model multi-dimensionally measures workers' attitudes toward technology acceptance, system trust, and the establishment of a Data-Based Ethics Culture. The findings suggest that the success of a smart safety culture depends more on workers' trust than on technical performance. Consequently, this study proposes institutionalizing the "Declaration of Non-Punitive Use of Data" as a prerequisite for KSCI certification and mandating Digital Literacy education for elderly workers. These measures are essential for fostering a sustainable and inclusive smart safety environment in the digital era.