Improve soundproofing of exterior walls in timber frame construction afterwards?

Good day, is it possible to improve the sound insulation of the exterior walls of a timber frame house afterwards? We would like to improve the sound insulation both from inside to outside and from outside to inside. Does anyone have experience with this?

Good day, is it possible to improve the sound insulation of the exterior walls of a timber frame house afterwards? We would like to improve both the sound insulation from inside to outside as well as from outside to inside.

Do the passing trucks distort your lane because you snore so loudly and/or is the house a cardboard box from 1960?

Does anyone have experience with this?

The company Knauf with a product called Silentboard, for example. But maybe you could enlighten us a bit about the background first.