backpack nagiso to nakatsugawa station

Can I send my backpack from nagiso station to nakatsugawa station? I M travelling from Nagano to Magome so I think I can jump out if the train un nagisoand from there to tsumago and Magome on foot. From Magome to nakatsugawa by bus and continue to Nagoya

No, but there is a luggage forwarding service between Tsumago and Magome:
http://tumago.jp/english/forwarding.html

Probably easiest to use a luggage forwarding service (takuhaibin) from your hotel in Nagano to your hotel in Nagoya. For that distance, it can probably get there the same day if you send it out early enough.
http://www.global-yamato.com/en/hands-free-travel/

I have walked from Nagiso to Magome and apart from getting just a little lost before reaching Tsumago it was very pleasant so it's very doable. I would agree with the PP that sending your backpack ahead to Nagoya is the best plan.