@ Nandhini , noodles is not healthy snack but once in a week you can take atta or multi grain noodles.
The healthy snack should contains good nutrients like nuts, fresh fruits, veg juice, roasted chana, steamed chana, bhel, popcorn without butter, high fiber biscuits, brown bread S/W, steamed corn, boiled peanuts, egg white boiled, egg white omlette, egg white bhurji, etc.