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In this modern era, DC power supplies can be used in almost all electronic devices. DC power supplies are used in low-voltage and high-voltage electronic systems such as for DC electric motors. Therefore, the use of a DC power supply system requires a system that is able to convert DC voltage from one DC voltage level to another DC voltage level which is commonly called a DC-DC converter. One of the DC-DC converters is the SEPIC converter. The SEPIC converter is capable of producing an output voltage that is greater or less than the input voltage without changing its polarity. DC motor will be serialized with SEPIC Converter to get maximum speed with increased voltage. In addition, controllers are also needed to control and maintain speed when distubance occurs. Sliding Mode Control (SMC) is commonly used control for systems that have a non-linear response such as SEPIC converters. In this study, SMC is implemented on a dc motor with a SEPIC Converter, as an angular speed controller for a dc motor. In the results of the study, the steady state error in the angular speed response is less than 5%.