He last played in September and was put on a training regime after being ruled unfit and overweight.
"I have had a good, constructive talk with Tony and the senior management and we all agree this is the best way forward for me," said the 23-year-old.
Baggies boss Tony Pulis has said that Berahino is "close" to a return.
The former England Under-21 international's form has suffered since he reacted angrily to a bid from Tottenham being turned down on transfer deadline day in summer 2015.
He scored seven times in 35 games last season, compared to 20 goals in 45 appearances in 2014-15, after threatening to not play for club chairman Jeremy Peace.
"This last year has been the most difficult of my career and it has left me short of the form and fitness required for the Premier League," said Berahino.
"I have never been a player who lacked confidence or a belief in himself but that has been where I have found myself and it has hit me hard.
"It has left me feeling depressed and struggling for focus which has made it even more difficult to regain full fitness."
In a statement, the club said it hopes the "change of environment" at the camp in the south of France will help Berahino return to full fitness.
West Brom host Burnley in the Premier League on Monday with full commentary available on BBC Radio 5 live from 20:00 GMT.

Police in Nyala, the capital of South Darfur state, fired tear gas at protesters throwing stones and burning tyres in the streets, witnesses said.
Several protesters chanted slogans calling for the government's downfall.
Since June, Sudan has seen sporadic protests against government austerity measures, including fuel subsidy cuts.
The country's authorities have been trying to cut spending since Sudan lost three-quarters of its oil revenue when South Sudan seceded last year.
Demonstrators in Nyala chanted "No to high prices" and "People want to change the regime", according to witnesses.
Bothina Mohmed Ahmed, a spokeswoman for the state of South Darfur, said it was not known how the six deaths had happened, and that an investigation had been launched.
Opposition activists and media accused the police of using live ammunition.
The protests started on Monday when local students "rejected the price of transport announced by the government", Ms Ahmed said, adding that "other groups" had joined the protests and attacked government buildings.
"This has been happening on the main roads and in the main market area. There's been some damage to buildings," African Union-UN peacekeeping mission spokesman Christopher Cycmanick told AFP.
The anti-austerity protests in Sudan began in June among students in Khartoum, but have since spread to other social groups and areas.
They had recently dwindled as a result of the Muslim holy month of Ramadan, which began on 20 July.
Until this year, Sudan had escaped the unrest characteristic of recent uprisings in Arab countries such as neighbouring Egypt, but correspondents say economic hardship caused by austerity has led to growing dissatisfaction with President Omar al-Bashir.

Millie the cat has been left with a suspected broken jaw from the attack, which the RSPCA described as "sickening".
The video shows two men walking towards Millie in Derby, then one kicks her and she flies several feet in the air.
It happened outside the Guinness Trust flats in Sidney Street at about 16:25 GMT on Thursday.
RSPCA inspector Sarah Burrows said: "It is an unprovoked attack which has sadly left Millie with a suspected broken jaw.
"Inflicting such a horrific attack on a defenceless cat is sickening and it's important we track down the people responsible."
The charity asked anyone with information to contact them.
They warned that anyone found guilty of causing unnecessary suffering to an animal could face up to six months in prison and a fine of up to Â£20,000.
West Brom striker Saido Berahino says he is in a positive frame of mind despite being sent back to a conditioning camp in France.
[NEXT_CONCEPT]
Six people have been killed in violent protests against high transport prices in the Darfur region of western Sudan, local officials say.
[NEXT_CONCEPT]
The RSPCA is trying to find a man who was caught on CCTV kicking a cat "very hard" into the air.