Search for "TSOP1738 Library for Proteus" on specialized, open-source electronics platforms.
C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\Data\LIBRARY tsop1738 proteus library download
Note: Since there is no "infrared beam" source in Proteus, you simulate the incoming 38kHz signal by applying a pulse generator to the input or, more realistically, by using a virtual microcontroller (like Arduino) to output a 38kHz signal to a pin acting as the "source." Example Project: Remote-Controlled LED Search for "TSOP1738 Library for Proteus" on specialized,