No problem at all.
Perhaps it would help to look at some basic examples.
There are a few that fit.
Collection of examples from discourse.threejs.org
With this enhancement the lady moves additionally sideways.
let model, c, size; // model center and size
let t = 0;
let x0 = xPosition;
let dx;
animate();
function animate( ) {
requestAnimationFrame( animate );
yRotation += 0.005;
t += 0.001;
dx = Math.sin( t )
xPosition = x0 + dx;
move( model );
renderer.render( scene, camera );
}