Just like wall insulation, your options will depend on your home, including how your floors are constructed and whether there is an accessible space below them, e.g., through an existing hatch or cutting floorboards to get access beneath.
If you have floorboards with space below, then suspended under floor insulation could be an option. This works by fixing a net to the wooden joists your floor rests on, and then filling that net with insulating material.
If the crawl space below the joists is accessible and deep enough to enter it might be possible for a fitter to do this with minimal disruption. Otherwise, you may need to clear your room of furniture and floorboards will be lifted to fit the insulation from above.
If your flooring is laid on concrete, then you could install insulating board on top of the concrete. If you have a carpet, then a thicker underlay could add further insulation.
As with walls, you need to make sure there’s no existing damp problems or a risk that the wrong insulation could lead to damp forming. Speak to an expert before any insulation work begins.