Australian number one Stosur will be cheered on by her home fans at the Sydney Olympic Park Tennis Centre from January 6-12 as she puts the final touches to her Australian Open preparations in what is usually a particularly strong WTA field.
The former US Open champion, who will also play in Brisbane the week before, said: "Every year the tournament is tough, the cut off is around 25 in the world so you really jump straight in the deep end there.
"Going into the first Grand Slam of the year you want to be playing the best in the world and that always happens in Sydney."
World number six Tsonga will compete in the men's draw and he added: "For me it's very important to prepare well for the Australian Open.
"Playing the Sydney event provides great preparation."
The Frenchman will arrive in Sydney having played in the Hopman Cup in Perth the previous week.
Further announcements about the line-up are expecting in the coming weeks.