Thinly slice the chicken breasts lengthwise into very thin cutlets.
In a large mixing bowl, whisk together the soy sauce, lime juice, grated ginger, ground black pepper, and coconut sugar until the sugar dissolves.
Add the sliced chicken to the marinade and toss to coat. Cover and refrigerate for 2 hours.
After marinating, remove the chicken from the marinade and discard the used marinade.
Thread the chicken onto skewers in a zigzag or folded manner so pieces are snug; place a sage leaf at the end of each skewer or tuck leaves between pieces as desired.
Preheat a grill or grill pan over medium-high heat. Grill the skewers, turning occasionally, until the chicken is cooked through and golden brown, about 15–20 minutes depending on thickness.
Remove from the grill and let rest briefly before serving.