The Sentinelese are famously hostile toward outsiders. Would they drink from a strange can that appeared on the beach? Would they know that it is a drink, or even how to open it? These are things we know because we grew up with the concept of canned soda. But even with that knowledge, I sure as hell wouldn't drink from a random soda can I found sitting on a beach. I find it hard to imagine that the Sentinelese, who shoot arrows at anyone they see approaching their island, would interpret a random can as a sign of goodwill (let alone as something they're supposed to ingest.)

They may assume it's a weapon, or some kind of cursed item. If they do something to agitate it, like shooting an arrow or throwing a rock, they'd probably be terrified by the exploding carbonation - which could reinforce the idea of it being a weapon or something demonic.