The 19-year-old, who has yet to make a competitive first-team appearance for the Premier League club, scored eight goals on loan at Poole last season.
Glovers manager Darren Way said: "We feel this next move is a fantastic move for Sam and Yeovil.
"We must thank (Bournemouth manager) Eddie Howe for trusting us with the development of his young talent."
Yeovil begin their League Two season on Saturday with a trip to face Luton Town.
Find all the latest football transfers on our dedicated page.

Kirsty Maxwell, from Livingston, died on Saturday in the tourist area in south east Spain.
It is thought that she was part of a group of more than 30 women who had travelled to the resort for a hen weekend.
A British man was arrested by police in Benidorm in connection with the incident, before being later released.
A Foreign Office spokesman said: "We are supporting the family of a British national who sadly died in Benidorm on 29 April."
He added: "We are in contact with the local authorities following the arrest of a British man."
Mrs Maxwell's body is understood to be found near the swimming pool at the Apartamentos Payma on Saturday.
Bournemouth forward Sam Surridge has joined League Two side Yeovil Town on a season-long loan deal.
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A West Lothian woman has died at a holiday apartment block in Benidorm during a hen party.