Yes, you can just sand them but give the paint time to cure properly first.
Make sure you feather the edges of the area you sand so that it is smooth enough that the next coat of paint doesn't show the area you sanded.
If there is detail there that you may sand off then you could also strip the paint if needed.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon