You can take a train from Gotemba to Odawara via Shin-Matsuda in around 57 min.
How to get from Gotemba to Odawara
From Gotemba train to Shin-Matsuda then train to Odawara. 57 min ¥733. From Gotemba Premium Outlets bus to Hakone-Yumoto then train to Iriuda. 1 h 2 min ¥1779. From Gotemba taxi to Odawara. 33 min ¥14554. From Gotemba drive to Odawara. 33 min ¥486.