how to hire someone from another country as sales representative based on commission?
The resistance to having an interest in a sales position, commission OR salaried, is the risk you're asking the salesperson to take. Ways to lower the risk for the salesperson are to perfect your sales PROCESS first. And if you're branching out to a new country or region, you need to validate that process still works with the new demographics and attitudes yourself, before you ask a salesperson to pick up responsibility. This usually requires the home office to send someone to the new region and test and figure out the adjustments that need to be made to the sales process, before seeking a sales representative that is local to that region.
If you can prove that a specific process works to generate leads and close sales at a specific rate, then you can find a salses representative willing to make the trade in time for commission, because the formula for how much effort will be rewarded with what amount of income will be proven and visible. Asking someone to open your market in a new region for you with no prior testing of your sales process in that new region is a high-risk situation. Asking them to do so for commission instead of straight salary raises the risk they will not succeed even higher. You'll find very few willing to try, and those that do are likely to under-perform.
Commissioned sales are only appropriate when you have already done the work to perfect the sales process. Trying to offer commission where the risk is high means the commission must also be high (think greater than 50% commission).