This research aims to analyze and explain the direct effect of competency-based training on workability and employees' performance, analyze and explain the indirect effect of competency-based training on employees' performance through workability on sales force employees at PT Telkom Indonesia Witel Jatim Surabaya.This research used explanatory research method, with a quantitative approach with 43 respondents as a sample. Data analysis that be used in this research is descriptive analysis and path analysis. The results of this research are: there is significant impact of competency-based training on workabilitywith t score amounted to 3,6. There is significant impact of competency-based training on employees' performancewith t score amounted to 2,293. There is significant impact of workability on employees' performance with t score amounted to 3,605. There is an indirect effect of competency-based training on employees' performancethrough workabilityamounted to 0,247. R-square value of competency-based training on workability and employees's performance amounted to 0,491 (49,1%).