A modular laser package system may be used to mount one type of laser package, such as a coaxial or TO (transistor outline) can laser package, to a circuit board, such as a transmitter board or a motherboard, designed to receive another type of laser package housing, such as a butterfly-type laser package housing. The modular laser package system may include a circuit board mounting platform, a laser housing mount to mount the laser package to the circuit board mounting platform, and a mounting base to facilitate mounting to the transmitter board or motherboard. The modular laser package system may also include a temperature control device, such as a thermoelectric cooler (TEC), and a temperature sensor, such as a thermistor, mounted to the laser housing mount to control and monitor the temperature of the laser package.