The calculated distance (air line) between Sai Kung and Cheung Sha Wan is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Cheung Sha Wan is certainly longer, as only the direct route (as the crow flies) between Sai Kung and Cheung Sha Wan has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles