Andrew’s Studio over at Sims 4 Studio has just released a beta version of The Sims 4 Pose Player. This tool allows for custom poses within the game with just a few clicks.
This is a mod that will add the option to play poses and animations in game. It is still in beta, so please let me know if you have any problems with it. It adds an interaction to your sims called Pose By Name. Just click on your sim like you would to do anything else.
When you choose the Pose By Name option, you can enter the name of the animation (I have attached a text file below with all EA in-game animation names below) and your sim will do that animation until you cancel the interaction. You can use it on your sim or any other sim even if it is not part of your sim’s household. To stop a sim from posing, just click them again and you will have an option to stop the pose.