Hall was recognised for an "outstanding effort balancing the fine line between being creative and business-minded in her musical career".
Hall told the Bay of Plenty Times Weekend the signing was really exciting and felt pretty surreal.
"I've been working really hard for such a long time and for it to finally be a reality is a bit overwhelming."
Hall said signing to Sony meant she would have opportunities to expand, and potentially tour and release music overseas.
She said she was working as a presenter of a show, which was yet to air on Maori TV, but was also looking forward to getting back in the recording studio.
The signing comes as New Zealand Music Month comes to an end.
Hall, who grew up in Maungatapu, previously told the Bay of Plenty Times Weekend that singing with fellow Bay-born Stan Walker at Beyonce's New Zealand concerts had been the highlight of her career so far.
Ria Hall is in Tauranga tonight at Classic Flyers for Fashion for Families Charity Some door sales are still available. From 6pm, with other singers Jessie and Georgina Matthews.