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It depends somewhat on the condition of the sand. If it’s well packed and solid all-wheel drive would suffice, but I wouldn’t rely on it on loose, deep sand. For that I would want a proper four-wheel drive.
You first need to decide the level of off-roading you will be doing because that will determine if you need a four-wheel drive or you only need an all-wheel drive SUV. From what you have told us I suspect that an SUV, such as a Kia Sorento, Toyota Kluger, or a Nissan X-Trail would be the best all-round vehicle for you. All of those would fit your budget, they will all go off-road to a reasonable degree, and they're all reliable. The Mitsubishi Triton is a hard-riding ute, which I don't think is what you want, but the Suzuki Grand Vitara is a good vehicle and would also fit your needs.
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