"I'm over the moon with the contract extension," Sandilands told the club's official website.
"It's been a dream come true for me to play for such a wonderful team like Mamelodi Sundowns and now I'm really glad that I get to play for the club a little bit longer.
"I'm thankful for the opportunity and hopefully I can contribute to the success of the team.
"We look to get a positive result against Kaizer Chiefs. It's going to be tough but we are determined to do well in order stay in a good position on the log."
Sandilands will get another chance to impress when the team travel to Soweto to take on Kaizer Chiefs in the PSL on Wednesday evening.
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Thuso Phala (Platinum Stars)
Itumeleng Khune (Kaizer Chiefs)
Bernard Parker (Kaizer Chiefs)
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18% Thuso Phala (Platinum Stars)
75% Itumeleng Khune (Kaizer Chiefs)
7% Bernard Parker (Kaizer Chiefs)
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