If your door already has molding around it you ll need to pry it off.
Sound insulation doors.
If sound can leak around the sides of your door consider adding soundproofing rubber to the perimeter.
The primary purpose of the insulation is to keep cold weather out.
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Another option would be to get a solid core door to prevent noise from coming through.
Hollow doors tend to be much worse for sound insulation since they re not a heavy mass.
Soundproofing rubber is typically a dense form of neoprene the same stuff they use in wetsuits to insulate against the cold.
One of the most common types of such doors has a polyurethane foam insulation core that s encased between layers of steel.
Solid composite interior door.
However you can install a new solid wood or metal door to cut out the sound significantly.
Solid core doors are the most cost effective soundproof doors.
Wood composite is a slurry of wood fiber and polyurethane resins that can closely mimic the look of real wood and which provides excellent insulation against both sound.
Because this barn style door slides on a track mounted above the door frame it can be thicker and thus more soundproof than a door mounted within the doorframe.