The 37-year-old beauty, whose older sister is Modern Family actress , wore a maroon string bikini while by a swimming pool at her resort.
' vol.1 daytime ☀️✨,' the ingenue wrote in her Instagram caption.
The star has been on the ninth season of 's hit real estate reality show Selling Sunset in recent months.
In January the siblings made the rare move of posing together at the party in Miami as both looked incredible in strapless dresses.
'Family!' read Sofia's first caption. 'Only in Miami u can have this much fun! Celebrating Toty with all this beautiful people! Luv u❤️❤️,' wrote the ex-wife of Joe Manganiello in a later post.
Sandra Vergara looked to be having a blast in Hawaii this week in images posted to Instagram
The 37-year-old beauty, whose older sister is Modern Family actress Sofia Vergara wore a maroon string bikini while by a swimming pool at her resort
Sandra also took to her Instagram page to rave about the 'ultimate' party in Miami.
Sofia looked amazing in a low-cut coral-colored gown that flaunted her assets as her younger sibling glowed in a feminine pale pink dress.
Also at the bash were Veronica Vergara, Rosa Vergara, Gloria Luque and friend Marianella.
'As the pressure turns up in their personal and professional lives, some might not have what it takes to keep their seat at the brokerage,' the synopsis says.
'As the landscape in Los Angeles quickly changes, everyone will have to adapt to a new reality.'
Also on the series are , , , , Mary Bonnet, Romain Bonnet, , Alanna Gold, , and Brett Oppenheim.
Despite working as a real estate agent, Sandra has quite the lengthy IMDB page.
The Colombian bombshell has appeared on countless television shows over the years, including The Bold And The Beautiful and CSI.
Surprisingly, Sandra and Sofia tend to keep their careers quite separate.
The star has been on the ninth season of Netflix's hit real estate reality show Selling Sunset in recent months
Here she wore sandals as she posed by the infinity pool during a clip
And she also had a robe on as she carried a bag after hitting the beach
The newcomer also posed with a hunky man by a waterfall
The pair rarely appear together in public, although they did make a memorable red carpet appearance together in 2005.
According to E!, Sandra is actually Sofia's cousin, but she was legally adopted by Sofia's family when she was very young and raised alongside her.
Announcing her role on on social media, Sandra wrote: 'Three new faces on Selling the OC. And just One on Selling Sunset! And that’s yours truly.'
She added: 'And let’s just say I brought a bit more sparkle, depth, and mischief to the Strip.'
In another post, she wrote: 'Well… this was fun. Beyond grateful and honored to be part of this wild, wonderful experience! MORE to come. Stay tuned for the magic.'
Sandra and Sofia rarely appear together in public, although they did make a memorable red carpet appearance together in 2005.
In January the siblings made the rare move of posing together at the Toty party in Miami as both looked incredible in strapless dresses
While Sandra gets back to work on real estate, her big sister Sofia is taking some time off work for herself.
Discussing how she balances family life with work - as she is currently a judge on America's Got Talent - : 'I think I am getting better at taking my time off.
'I think I have worked hard enough my whole life that I am finally beginning to let myself enjoy my vacations and say I'm taking time off,' she revealed.
The Colombian actress noted that it can be scary to take time away as an actress in Hollywood, but stressed that it's important to her.
She continued, 'As actors you're so scared to take time away in case you miss your moment. But it's tough.'
